Heterocyclic compounds, medicaments containing them, use and processes for the preparation thereof

ABSTRACT

The present invention relates to compounds of general formula (I) 
     
       
         
         
             
             
         
       
     
     and the tautomers and the salts thereof, particularly the pharmaceutically acceptable salts thereof with inorganic or organic acids and bases, which have valuable pharmacological properties, particularly an inhibitory effect on epithelial sodium channels, and the use thereof for the treatment of diseases, particularly diseases of the lungs and airways.

FIELD OF THE INVENTION

The present invention relates to compounds of general formula (I)

and the tautomers and the salts thereof, particularly the pharmaceutically acceptable salts thereof with inorganic or organic acids and bases, which have valuable pharmacological properties, particularly an inhibitory effect on epithelial sodium channels, the use thereof for the treatment of diseases, particularly diseases of the lungs and airways.

BACKGROUND INFORMATION

Amiloride type compounds are known from the prior art as active substances for example for the treatment of diseases of the lungs and airways (J. Med. Chem. 49 (2006) 4098-4115). WO 08135557 discloses compounds of similar structure showing ENaC (Epithelial Sodium Channel) inhibitor activity.

The problem of the present invention is to prepare new compounds which may be used therapeutically for the treatment of pathophysiological processes treatable by the blockade of an epithelial sodium channel, particularly for the treatment of the lungs and airways.

BRIEF SUMMARY OF THE INVENTION

It has surprisingly been found that the problem mentioned above is solved by compounds of formula (I) of the present invention. The new compounds of the present invention exhibit a reduced permeability being beneficial for topical lung treatment.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a compound of formula (I),

wherein A, A′ denote independently from each other —CH₂— or —CH₂—CH₂—;

R is —NR¹R², —NR³R⁴R⁵⁽⁺⁾Z₁ ⁽⁻⁾ or OR¹³;

X is halogen, preferably Cl or Br; Z₁ ⁽⁻⁾ is halogen anion or an organic acid anion, Z₂ ⁽⁻⁾ is halogen anion or an organic acid anion, Z₃ ⁽⁻⁾ is halogen anion or an organic acid anion, Z₄ ⁽⁻⁾ is halogen anion or an organic acid anion, R¹, R² are selected independently from each other

-   -   H, —C(NH₂)NH, —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻, —C₁₋₃-alkyl,         —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹²,     -   —C₁₋₃-alkyl-COOH, —C₁₋₄-alkyl-CO—Y²—R¹¹, —CO-phenyl-CO—O—R¹³,         —CO—C₁₋₄-alkyl, —CO—C₁₋₃-alkyl-NR⁶R⁷, —CO—C₁₋₃-alkyl-N(CH₃)₃ ⁺Z₃         ⁻, —CO—C₁₋₄-alkyl-Y¹—R⁹, —CO—O—C₁₋₄-alkyl-R⁸,         —CO—NH—C₃₋₇-cycloalkyl, —CO—NH—C₁₋₄-alkyl, —CH₂—CO—O—C₁₋₃-alkyl,         —CH₂—CO—O—C₁₋₃-alkyl-phenyl and —SO₂—R¹⁰;     -   R⁶ is selected from among-C₁₋₃-alkyl,         -   H, —C₁₋₄-alkyl-OH, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH;     -   R⁷ is selected from among-C₁₋₃-alkyl, —CO—O—C₁₋₃-alkyl,         —C₁₋₄-alkyl-OH,         -   H, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH;     -   R⁸ is H or phenyl;     -   R⁹ is selected from among H, —C₁₋₃-alkyl, OH, —NR⁶R⁷ and ═O;     -   R¹⁰ is C₁₋₃-alkyl or an optionally substituted N-containing         nonaromatic heterocycle;     -   R¹¹ is selected from among H, C₁₋₃-alkyl, ═O, —N(CH₃)₂ and         —N(CH₃)₃ ⁺Z₄ ⁻;     -   R¹² is selected from among H, halogen, —COOH,         —PO(OC₁₋₄-alkyl)OH, optionally substituted at the 2, 3 or 4         position of the C₁₋₄-alkyl group by —N(C₁₋₃-alkyl)₂ or         —N(C₁₋₃-alkyl)₃ ⁺Z₄ ⁻, and —PO(OC₁₋₄-alkyl)₂, —PO(OH)₂;     -   R¹³ is H or C₁₋₄-alkyl;     -   Y¹ is selected from among an optionally substituted 5- to         8-membered to N-containing nonaromatic heterocycle,         -   —N(C₁₋₃-alkyl)-C₂₋₄-alkyl-N(C₁₋₃-alkyl)₂         -   and —N(C₁₋₃-alkyl)-C₂₋₄-alkyl-N⁺(C₁₋₃alkyl)₃Z₁ ⁽⁻⁾;     -   Y² is an optionally substituted 5- to 8-membered N-containing         nonaromatic heterocycle;         or R¹ and R² are together with the nitrogen atom they are         attached to an optionally substituted 4-7-membered heterocycle,         containing at least one N and optionally one or more heteroatoms         selected from the group consisting of piperazino, morpholino,         piperidino; thiomorpholino, thiomorpholino-1-oxide,         thiomorpholinon-1,1-dioxide, diazepane and pyrrolidino, wherein         the nitrogen atoms may be substituted by a group selected from         among phenyl, C₁₋₃-alkylsulfonyl, C₁₋₃-alkyl and —CO—C₁₋₃-alkyl;         R³, R⁴, R⁵ denote independently from each other —C₁₋₃-alkyl;         or tautomers or pharmacologically acceptable acid addition salts         thereof.

Preferred compounds of formula (I) are those, wherein

A, A′ are both —CH₂—CH₂—;

R is —NR¹R² or —NR³R⁴, R⁵⁽⁺⁾X⁽⁻⁾;

X is halogen; R¹, R² are selected independently from each other from

-   -   H, —C(NH₂)NH, —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻, —C₁₋₃-alkyl,         —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹², —C₁₋₃-alkyl-COOH,     -   —C₁₋₄-alkyl-CO—Y²—R¹¹, —CO-phenyl-CO—O—C₁₋₄—R¹³, —CO—C₁₋₄-alkyl,         —CO—C₁₋₃-alkyl-NR⁶R⁷,     -   —CO—C₁₋₃-alkyl-N(CH₃)₃ ⁺Z₃ ⁻, —CO—C₁₋₄-alkyl-Y¹—R⁹,         —CO—O—C₁₋₄-alkyl-R⁸, —CO—NH—C₃₋₇-cycloalkyl, —CO—NH—C₁₋₄-alkyl,     -   —CH₂—CO—O—C₁₋₃-alkyl, —CH₂—CO—O—C₁₋₃-alkyl-phenyl, and —SO₂—R¹⁰;     -   R⁶ is selected from —C₁₋₃-alkyl, H, —C₁₋₄-alkyl-OH,         —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH;     -   R⁷ is selected from among-C₁₋₃-alkyl, —CO—O—C₁₋₃-alkyl,         —C₁₋₄-alkyl-OH, H, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH;     -   R⁸ is H or phenyl;     -   R⁹ is selected from among H, —C₁₋₃-alkyl, —OH, —NR⁶R⁷ and ═O;     -   R¹⁰ is C₁₋₃-alkyl or an optionally substituted N-containing         nonaromatic heterocycle;     -   R¹¹ is selected from among H, —C₁₋₃-alkyl, ═O, —N(CH₃)₂ and         —N(CH₃)₃ ⁺X⁻;     -   R¹² is H or halogen;     -   R¹³ is H or —C₁₋₄-alkyl;     -   Y¹ is an optionally substituted 5- to 8-membered N-containing         nonaromatic heterocycle;     -   Y² is an optionally substituted 5- to 8-membered N-containing         nonaromatic heterocycle;         or R¹ and R² are together with the nitrogen atom they are         attached to an optionally substituted 4-7-membered heterocycle         containing at least one N-atom;         R³, R⁴, R⁵ denote independently from each other —C₁₋₃-alkyl;         or tautomers or pharmacologically acceptable acid addition salts         thereof.

Also preferred are compounds of formula (I), wherein

R is —NR¹R²;

or tautomers or pharmacologically acceptable acid addition salts thereof.

Also preferred are compounds of formula (I), wherein

R¹, R² denote independently from each other —C₁₋₄-alkyl-CO—Y²—R¹¹

-   -   or —CO—C₁₋₄-alkyl-Y¹—R⁹;     -   R⁹ is selected from among H, —C₁₋₃-alkyl, —OH, —NR⁶R⁷ and ═O;     -   R¹¹ is selected from among H, —C₁₋₃-alkyl, ═O, —N(CH₃)₂ and         —N(CH₃)₃ ⁺X⁻;     -   Y¹ is selected from a linker of formula (a1) to (j1)

-   -   -   wherein         -   * denotes the attachment point to the alkyl moiety of             —CO—C₁₋₄-alkyl-*         -   ** denotes the attachment point to R⁹

    -   Y² is selected from a linker of formula (a2) to (h2)

-   -   -   wherein         -   * denotes the attachment point to the carbonyl moiety of             —C₁₋₄-alkyl-CO—*         -   ** denotes the attachment point to R¹¹             or tautomers or pharmacologically acceptable acid addition             salts thereof.

Also preferred are compounds of formula (I), wherein

R¹, R² independently from each other denote —C(NH₂)NH or —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻; or tautomers or pharmacologically acceptable acid addition salts thereof.

Also preferred are compounds of formula (I), wherein

R¹, R² independently from each other are selected from among

-   -   H, —C₁₋₃-alkyl, —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹²,         —C₁₋₃-alkyl-COOH, —CH₂—CO—O—C₁₋₃-alkyl and         —CH₂—CO—O—C₁₋₃-alkyl-phenyl;         or tautomers or pharmacologically acceptable acid addition salts         thereof.

Particularly preferred are compounds of formula (I), wherein

R¹, R² independently from each other are selected from among —CO-phenyl-CO—O—C₁₋₄—R¹³, —CO—C₁₋₄-alkyl and —CO—C₁₋₃-alkyl-NR⁶R⁷; or tautomers or pharmacologically acceptable acid addition salts thereof.

Also particularly preferred are compounds of formula (I), wherein

R¹, R² independently from each other denote —CO—O—C₁₋₄-alkyl-R⁸ or —SO₂—R¹⁰; or tautomers or pharmacologically acceptable acid addition salts thereof.

Also particularly preferred are compounds of formula (I), wherein

R¹ or R² is hydrogen; or tautomers or pharmacologically acceptable acid addition salts thereof.

A further embodiment of the current invention is compounds of formula (I) or a pharmaceutically acceptable salt thereof for use as a medicament.

A further embodiment of the current invention is compounds of formula (I) or a pharmaceutically acceptable salt thereof for use in the treatment of a disease selected from among respiratory diseases or complaints and allergic diseases of the airways.

A further embodiment of the current invention is compounds of formula (I) or a pharmaceutically acceptable salt thereof for use in the treatment of a disease selected from among chronic bronchitis, acute bronchitis, bronchitis caused by bacterial or viral infection or fungi or helminths, allergic bronchitis, toxic bronchitis, chronic obstructive bronchitis (COPD), asthma (intrinsic or allergic), pediatric asthma, bronchiectasis, allergic alveolitis, allergic or non-allergic rhinitis, chronic sinusitis, cystic fibrosis or mucoviscidosis, alpha-1-antitrypsin deficiency, cough, pulmonary emphysema, interstitial lung diseases, alveolitis, hyperreactive airways, nasal polyps, pulmonary oedema and pneumonitis of different origins.

A further embodiment of the current invention is a pharmaceutical composition comprising at least one compound of formula (I) or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.

A further embodiment of the current invention is medicament combinations which contain, besides one or more compounds of a compound of formula (I), as further active substances, is one or more compounds selected from among the categories of further ENaC inhibitors, betamimetics, anticholinergics, corticosteroids, PDE4-inhibitors, LTD4-antagonists, EGFR-inhibitors, dopamine agonists, H1-antihistamines, PAF-antagonists, MAP-kinase inhibitors, MPR4-Inhibitors, iNOS-Inhibitors, SYK-Inhibitors, corrections of the cystic fibrosis transmembrane regulator (CFTR) and CFTR potentiators or double or triple combinations thereof.

TERMS AND DEFINITIONS

Terms not specifically defined herein should be given the meanings that would be given to them by one of skill in the art in light of the disclosure and the context. As used in the specification, however, unless specified to the contrary, the following terms have the meaning indicated and the following conventions are adhered to.

In the groups, radicals, or moieties defined below, the number of carbon atoms is often specified preceding the group, for example, C₁₋₆-alkyl means an alkyl group or radical having 1 to 6 carbon atoms. In general, for groups comprising two or more subgroups, the last or first named subgroup is the radical attachment point indicated as open hyphen, for example, the substituent “aryl-C₁₋₃-alkyl-” means an aryl group which is bound to a C₁₋₃-alkyl-group, the latter of which is bound to the core or to the group to which the substituent is attached.

If a compound of the present invention is depicted in the form of a chemical name and also as a formula, in case of any discrepancy the formula shall prevail.

An asterisk is may be used in sub-formulas to indicate the bond which is connected to the core molecule as defined.

Unless specifically indicated, throughout the specification and the appended claims, a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound.

The phrase “pharmaceutically acceptable” is employed herein to refer to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, and commensurate with a reasonable benefit/risk ratio.

As used herein, “pharmaceutically acceptable salts” refer to derivatives of the disclosed compounds wherein the parent compound is modified by making acid or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic residues such as amines; alkali or organic salts of acidic residues such as carboxylic acids; and the like. For example, such salts include acetates, ascorbates, benzenesulfonates, benzoates, besylates, bicarbonates, bitartrates, bromides/hydrobromides, Ca-edetates/edetates, camsylates, carbonates, chlorides/hydrochlorides, trifluoracetates, citrates, edisylates, ethane disulfonates, estolates esylates, fumarates, gluceptates, gluconates, glutamates, glycolates, glycollylarsnilates, hexylresorcinates, hydrabamines, hydroxymaleates, hydroxynaphthoates, iodides, isothionates, lactates, lactobionates, malates, maleates, mandelates, methanesulfonates, mesylates, methylbromides, methylnitrates, methylsulfates, mucates, napsylates, nitrates, oxalates, pamoates, pantothenates, phenylacetates, phosphates/diphosphates, polygalacturonates, propionates, salicylates, stearates subacetates, succinates, sulfamides, sulfates, tannates, tartrates, teoclates, toluenesulfonates, triethiodides, ammonium, benzathines, chloroprocaines, cholines, diethanolamines, ethylenediamines, meglumines and procaines. Further pharmaceutically acceptable salts can be formed with cations from metals like aluminium, calcium, lithium, magnesium, potassium, sodium, zinc and the like. (also see Pharmaceutical salts, Birge, S. M. et al., J. Pharm. Sci., (1977), 66, 1-19).

The pharmaceutically acceptable salts of the present invention can be synthesized from the parent compound which contains a basic or acidic moiety by conventional chemical methods. Generally, such salts can be prepared by reacting the free acid or base forms of these compounds with a sufficient amount of the appropriate base or acid in water or in an organic diluent like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile, or a mixture thereof.

Unless specifically indicated, according to the invention a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound.

The term “substituted” as used herein, means that any one or more hydrogens on the designated atom is replaced with a selection from the indicated group, provided that the designated atom's normal valence is not exceeded, and that the substitution results in a stable compound.

By the term “optionally substituted” is meant within the scope of the invention the above-mentioned group, optionally substituted by a lower-molecular group. Examples of lower-molecular groups regarded as chemically meaningful are groups consisting of 1-200 atoms. Preferably such groups have no negative effect on the pharmacological efficacy of the compounds. For example the groups may comprise:

-   -   Straight-chain or branched carbon chains, optionally interrupted         by heteroatoms, optionally substituted by rings, heteroatoms or         other common functional groups.     -   Aromatic or non-aromatic ring systems consisting of carbon atoms         and optionally heteroatoms, which may in turn be substituted by         functional groups.     -   A number of aromatic or non-aromatic ring systems consisting of         carbon atoms and optionally heteroatoms which may be linked by         one or more carbon chains, optionally interrupted by         heteroatoms, optionally substituted by heteroatoms or other         common functional groups.

The term halogen generally denotes fluorine, chlorine, bromine and iodine.

The term “C_(1-n)-alkyl”, wherein n is an integer from 2 to n, either alone or in combination with another radical denotes an acyclic, saturated, branched or linear hydrocarbon radical with 1 to n C atoms. For example the term C₁₋₅-alkyl embraces the radicals H₃C—, H₃C—CH₂—, H₃C—CH₂—CH₂—, H₃C—CH(CH₃)—, H₃C—CH₂—CH₂—CH₂—, H₃C—CH₂—CH(CH₃)—, H₃C—CH(CH₃)—CH₂—, H₃C—C(CH₃)₂—, H₃C—CH₂—CH₂—CH₂—CH₂—, H₃C—CH₂—CH₂—CH(CH₃)—, H₃C—CH₂—CH(CH₃)—CH₂—, H₃C—CH(CH₃)—CH₂—CH₂—, H₃C—CH₂—C(CH₃)₂—, H₃C—C(CH₃)₂—CH₂—, H₃C—CH(CH₃)—CH(CH₃)— and H₃C—CH₂—CH(CH₂CH₃)—.

The term “carbocyclyl” as used either alone or in combination with another radical, means a mono- or multi-ring ring structure consisting only of carbon containing between one and four rings wherein such rings may be attached together in a pendent manner or may be fused. The term “carbocycle” refers to fully saturated and aromatic ring systems and partially saturated ring systems. The term “carbocycle” additionally encompasses spiro systems, and bridged systems.

The term “C_(3-n)-cycloalkyl”, wherein n is an integer 4 to n, either alone or in combination with another radical denotes a cyclic, saturated, unbranched hydrocarbon radical with 3 to n C atoms. For example the term C₃₋₇-cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.

The term “aryl” as used herein, either alone or in combination with another radical, denotes a carbocyclic aromatic monocyclic group containing 6 carbon atoms which may be further fused to a second 5- or 6-membered carbocyclic group which may be aromatic, saturated or unsaturated. Aryl includes, but is not limited to, phenyl, indanyl, indenyl, naphthyl, anthracenyl, phenanthrenyl, tetrahydronaphthyl and dihydronaphthyl.

The term “heterocyclyl” means a saturated or unsaturated mono- or polycyclic-ring systems including aromatic ring system containing one or more heteroatoms selected from N, O or S(O), with r=0, 1 or 2 wherein none of the heteroatoms is part of the aromatic ring. The term “heterocycle” is intended to include all the possible isomeric forms.

Thus, the term “heterocyclyl” includes the following exemplary structures which are not depicted as radicals as each form may be attached through a covalent bond to any atom so long as appropriate valences are maintained:

The term “heteroaryl” means a mono- or polycyclic-ring systems containing one or more heteroatoms selected from N, O or S(O)_(r) with r=0, 1 or 2 wherein at least one of the heteroatoms is part of aromatic ring. The term “heteroaryl” is intended to include all the possible isomeric forms.

Thus, the term “heteroaryl” includes the following exemplary structures which are not depicted as radicals as each form may be attached through a covalent bond to any atom so long as appropriate valences are maintained:

Many of the terms given above may be used repeatedly in the definition of a formula or group and in each case have one of the meanings given above, independently of one another.

PREFERRED EMBODIMENTS

The variables A, A′ are independently from each other —CH₂— or —CH₂—CH₂—. Preferably A and A′ are both —CH₂—CH₂— or A and A′ are different from each other —CH₂— or —CH₂—CH₂—. Particularly preferred A and A′ are both —CH₂—CH₂—.

The substituent R is selected from among —NR¹R², —NR³R⁴R⁵⁽⁺⁾Z₁ ⁽⁻⁾ and OR¹³, preferably —NR¹R² or —NR³R⁴R⁵⁽⁺⁾X⁽⁻⁾, most preferably —NR¹R².

The substituent X denotes halogen, preferably Cl or Br; most preferably Cl.

The substituent Z₁ ⁽⁻⁾ is halogen anion or an organic acid anion, preferably CF₃COO⁻, CH₃COO⁻, CF, Br⁻ or I⁻, particularly preferred Cl⁻ or I⁻.

The substituent Z₂ ⁽⁻⁾ is halogen anion or an organic acid anion, CF₃COO⁻, CH₃COO—, Cl⁻ Br⁻ or I⁻, particularly preferred Cl⁻ or I⁻,

The substituent Z₃ ⁽⁻⁾ is halogen anion or an organic acid anion, CF₃COO⁻, CH₃COO—, Br⁻ or I⁻, particularly preferred Cl⁻ or I⁻; The substituent Z₄ ⁽⁻⁾ is halogen anion or an organic acid anion, CF₃COO⁻, CH₃COO—, Cl⁻ Br⁻ or I⁻, particularly preferred Cl⁻ or I⁻;

The substituents R¹, R² are selected independently from each other from among H, —C(NH₂)NH, —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻, —C₁₋₃-alkyl, —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹², —C₁₋₃-alkyl-COOH, —C₁₋₄-alkyl-CO—Y²—R¹¹, —CO-phenyl-CO—O—R¹³, —CO—C₁₋₄-alkyl, —CO—C₁₋₃-alkyl-NR⁶R⁷, —CO—C₁₋₃-alkyl-N(CH₃)₃ ⁺Z₃ ⁻, —CO—C₁₋₄-alkyl-Y¹—R⁹, —CO—O—C₁₋₄-alkyl-R⁸, —CO—NH—C₃₋₇-cycloalkyl, —CO—NH—C₁₋₄-alkyl, —CH₂—CO—O—C₁₋₃-alkyl, —CH₂—CO—O—C₁₋₃-alkyl-phenyl and —SO₂—R¹⁰.

Especially preferred are the following combinations of Y¹ and R⁹ within the substituent —CO—C₁₋₄-alkyl-Y¹—R⁹:

If Y¹ denotes (a1), (d1) then R⁹ denotes H, C₁₋₃-alkyl, —O.

If Y¹ denotes (b1), (c1) then R⁹ denotes H or C₁₋₃-alkyl.

If Y¹ denotes (e1) or (j1) then R⁹ is selected from among H, C₁₋₃-alkyl, ═O, —OH, —O-Me-N(CH₃)₂ and —N(CH₃)₃ ⁺Z₄ ⁻.

If Y¹ denotes (f1), (g1), (h1), (i1) then R⁹ denotes H or C₁₋₃-alkyl.

Especially preferred are the following combinations of Y² and R¹¹ within the substituent —C₁₋₄-alkyl-CO—Y²—R¹¹:

If Y² denotes (a2), (d2) then R¹¹ denotes H, C₁₋₃-alkyl or —O⁻.

If Y² denotes (b2), (c2) then R¹¹ denotes H or C₁₋₃-alkyl.

If Y² denotes (e2) then R¹¹ is selected from among H, C₁₋₃-alkyl, ═O, —OH, —OMe-N(CH₃)₂ and —N(CH₃)₃ ⁺Z₄ ⁻.

If Y² denotes (f2), (g2), (h2) then R¹¹ denotes H or C₁₋₃-alkyl.

Preferably R¹ or R² are selected independently from each other from

H, —C₁₋₄-alkyl-CO—Y²—R¹¹ and —CO—C₁₋₄-alkyl-Y¹—R⁹, more preferably C₁-alkyl-CO—Y²—R¹¹ and —CO—C₁-alkyl-Y¹—R⁹.

Also preferably R¹, R² independently from each other denote H, —C(NH₂)NH or —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻, more preferably —C(NH₂)NH.

Also preferably R¹ or R² are selected from among —C₁₋₃-alkyl, —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹², —C₁₋₃-alkyl-COOH, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂—CO—O—C₁₋₃-alkyl-phenyl, more preferably methyl, —C₂alkyl-N(CH₃)₂, —C₁-alkyl-phenyl-R¹², —C₁-alkyl-COOH, —C₁-alkyl-CO—O-methyl and —CH₂—CO—O-benzyl.

Also preferably R¹, R² independently from each other are selected from among

H, —CO-phenyl-CO—O—C₁₋₄—R¹³, —CO—C₁₋₄-alkyl and —CO—C₁₋₃-alkyl-NR⁶R⁷, more preferably —CO-phenyl-CO—O-t-butyl, —CO-phenyl-CO—O-methyl, —CO-phenyl-CO—OH, —CH₂—R¹³, —CO—C₁₋₄-alkyl and —CO—C₁₋₂-alkyl-NR⁶R⁷.

Also preferably R¹, R² independently from each other are selected from —CO—O—C₁₋₄-alkyl-R⁸ or —SO₂—R¹⁹, more preferably —CO—O—CH₂-alkyl-R⁸ or —SO₂—R¹⁰. Most preferably R¹ or R² denotes hydrogen.

Particularly preferred R¹ and R² form together with the nitrogen atom they are attached to an optionally substituted 4-7-membered heterocycle, containing at least one N and optionally one or more heteroatoms, selected from the group consisting of piperazino, morpholino, piperidino; diazepane; thiomorpholino, thiomorpholino-1-oxido, thiomorpholino-1,1-dioxid, pyrrolidino, wherein the nitrogen atoms may be substituted by a group selected from among phenyl, C₁₋₃-alkylsulfonyl-, C₁₋₃-alkyl and —C═O—C₁₋₃-alkyl.

Also particularly preferred R¹ and R² are together with the nitrogen atom they are attached to a 4-7-membered heterocycle containing 1 to 3 N-atoms, preferably 1 or 2 N-atoms.

The substituents R³, R⁴, R⁵ denote independently from each other —C₁₋₃-alkyl, preferably methyl.

The substituent R⁶ is selected from —C₁₋₃-alkyl, H, —C₂₋₄-alkyl-OH, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH; preferably —C₁₋₃-alkyl, H, —C₂H₄-alkyl-OH,

The substituent R⁷ is selected from —C₁₋₃-alkyl, —CO—O—C₁₋₃-alkyl, —C₂₋₄-alkyl-OH,

H, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH; preferably H, C₁₋₃-alkyl and —C₂-alkyl-OH.

The substituent R⁸ denotes H or phenyl.

The substituent R⁹ is selected from H, —C₁₋₃-alkyl, OH, —NR⁶R⁷ and ═O.

The substituent R^(N) is selected from C₁₋₃-alkyl and an 5-8 membered optionally substituted, preferably 5 or 6-membered, N-containing nonaromatic heterocycle, preferably piperazino, 1-methylpiperazino, morpholino, piperidino, diazepane, 1-methyldiazepane; thiomorpholino, thiomorpholino-1-oxido, thiomorpholinon-1,1-dioxid and pyrrolidino, preferably piperazino, 1-methylpiperazino and morpholino.

The substituent R¹¹ is selected from H, C₁₋₃-alkyl, ═O, —N(CH₃)₂ and —N(CH₃)₃ ⁺Z₄ ⁻.

The substituent R¹² is selected from H, halogen, —COOH, —SO₃H, —PO(OC₁₋₄-alkyl)₂, —PO(OH)₂— and PO(OC₁₋₄-alkyl)OH optionally substituted at the 2, 3 or 4 position of the C₁₋₄-alkyl group by —N(C₁₋₃-alkyl)₂ or —N(C₁₋₃-alkyl)₃ ⁺Z₄ ⁻, —NH(C₁₋₃-alkyl)₂ and —N(C₁₋₃-alkyl)₃ ⁺Z₄ ⁻. Preferably R¹² denotes H or halogen.

The substituent R¹³ denotes H or C₁₋₄-alkyl, preferably H, methyl or t-butyl.

The substituent Y¹ is selected from an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle, —N(C₁₋₃-alkyl)-C₂₋₄-alkyl-N(C₁₋₃-alkyl)₂ and —N(C₁₋₃-alkyl)-C₂₋₄-alkyl-N⁺(C₁₋₃alkyl)₃Z₁ ⁽⁻⁾.

Preferably the substituent Y¹ is an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle.

More preferably Y¹ is selected from a linker of formula (a1) to (j1).

-   -   wherein     -   * denotes the attachment point to the alkyl moiety of         —CO—C₁₋₄-alkyl-*     -   ** denotes the attachment point to R⁹

The substituent Y² denotes an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle, preferably a 5- to 8-membered N-containing nonaromatic heterocycle substituted by ═O.

Preferably Y² is selected from among a linker of formula (a2) to (i2), more preferably from among a linker of formula (a2), (b2), (c2) and (d2).

-   -   wherein     -   * denotes the attachment point to the carbonyl moiety of         —C₁₋₄-alkyl-CO—*     -   ** denotes the attachment point to R¹¹

Preparation

Where no salt forms of compounds are specified, the compound may exist as a free base or a salt, depending on the synthesis conditions and the procedure of the workup and purification applied. The skilled person will appreciate that the compound is not limited to the free base or a certain salt form. Where salt forms of compounds are specified, the stoichiometry of the counterion is usually omitted. The skilled person will appreciate that the compound is not limited to the mono salt form and that it may exist as a disalt, trisalt or other compound:counterion stoichiometries. Furthermore, the skilled person will appreciate that such is compound may unexpectedly exist as a free base or as a salt with a different counterion, depending on the synthesis conditions and the procedure of the workup and purification applied. Solely for the purpose of yield determination, an estimate of the nature of the counterion and of compound:counterion stoichiometry is made (as indicated by the formula given).

The compounds according to the invention may be obtained using methods of synthesis which are known to the one skilled in the art and described in the literature of organic synthesis. If a substituent is not compatible with the synthetic methods described herein, the substituent may be protected with a suitable protecting group. General methods for functional groups protection and deprotection steps are described e.g. in: Greene, T. W. and Wuts, P. G. M. (eds.): Protective Groups in Organic Synthesis, third edition 1999; John Wiley and Sons, inc.

Preferably the compounds are obtained analogously to the methods of preparation explained more fully hereinafter, in particular as described in the experimental section.

As shown in scheme 1 compounds of general formula (I) can be prepared by reacting S-methylisothioureas of formula (II) with a primary amines of formula (III) in a solvent like THF, acetonitrile or DMF or in a solvent mixture, preferably in the presence of a base, especially when the primary amine (III) is applied as an acid addition salt, preferably at temperature between r.t. and boiling point of the solvent.

As shown in scheme 2 another method for preparation of compounds if formula (I) is alkylation of compounds of general formula IV with a suitable alkyl derivative R-LG (wherein the leaving group LG is preferably I, Cl, Br, OMesyl, or OTosyl), in the presence of a base such as K₂CO₃ in an appropriate solvent such as DMF or acetone at room temperature or elevated temperature as shown in scheme 2.

As shown in scheme 3 compounds of formula (I) with an amide group can be prepared by acylating the corresponding amine IV with an carboxylic acid using a coupling agent such as HATU or using an activated carboxylic acid derivative such as an carboxylic acid halide and a base such as TEA at room temperature or elevated temperature in a nonaqueous solvent.

As shown in scheme 4 compounds of formula (I) with a Ry group incorporating an acid can be prepared by hydrolyzing the corresponding ester V using a base such as NaOH, KOH or LiOH at room temperature or elevated temperature in an aqueous solvent.

As shown in scheme 5 compounds of formula (I) with a Ry group incorporating a quaternary amine can be prepared by alkylating the corresponding amine using an alkylating agent R-LG (wherein the leaving group LG is preferably I, Cl, Br, OMesyl, or OTosyl) e.g. MeI or Me₂SO₄ at room temperature or elevated temperature in an appropriate solvent in the presence or without an appropriate base.

As shown in scheme 6 amines of general formula (I) can be prepared by removing the respective protecting group PG. Suitable protecting groups PG in (VII) are e.g. BOC, FMOC and phthaloyl which can be removed by standard acidic conditions e.g. using acids like TFA, standard basic conditions using bases such as morpholine or hydrazine respectively.

As shown in scheme 7 compounds of formula (I) with a Ry group incorporating a guanidion group can be prepared by reacting the corresponding amine VIII with S-methylisothiourea hydrochloride or 1H-1,2,4-triazole-1-carboxamidine hydrochloride and a base such as DIPEA in an appropriate solvent at room temperature or a elevated temperature.

As shown in scheme 8 compounds of formula (I) with a sulfonamido or a sulfamoyl group can be prepared by reacting the corresponding amine with an alkyl or aryl sulfonic acid chloride or an alkyl or aryl sulfamoylchloride and a base such as TEA at room temperature or elevated temperature in a nonaqueous solvent.

As shown in scheme 9 when not commercially available, amines of general formula (III) can be prepared from compounds of general formula (IX) by removal of the respective protecting group, preferably the BOC, phthaloyl or FMOC protecting group which can be removed by standard acidic or basic conditions, respectively.

Alternatively benzyl groups can be used as protecting groups which can be removed by hydrogenation as shown in scheme 10.

Compounds of general formula (IX) or (X) (Scheme 9 or 10) can be modified using methods of synthesis which are known to the one skilled in the art and described in the literature of organic synthesis, preferably by functional group protection or deprotection steps, esterifications, amidations, reductions, alkylations or oxidations.

Intermediates of general formula (IX) with a R group incorporating a secondary (R′═H) or tertiary amine (R′=alkyl or amide or sulfonamide (R═CO-alkyl, —CO-aryl, —SO₂-alkyl, —SO₂aryl) can be prepared by using an alkylating agent R-LG (wherein the leaving group LG is preferably I, Cl, Br, OMesyl, or OTosyl) such as R—Br or R—Cl for alkylation of XI at room temperature or elevated temperature in an appropriate solvent in the presence or without an appropriate base as shown in scheme 11.

Compounds of formula (IX) with a sulfonamide or a sulfamoyl group can be prepared by reacting the corresponding amine XI with an alkyl or aryl sulfonic acid chloride or an alkyl or aryl sulfamoylchloride and a base such as TEA at room temperature or elevated temperature in a nonaqueous solvent as shown in scheme 12.

As shown in scheme 13 compounds of formula (XIV) with an urea group can be prepared by reacting the corresponding amine XI with an alkyl isocyanate at room temperature or elevated temperature in a nonaqueous solvent.

As shown in scheme 14 intermediate of general formula (XV) with an glycineamido group can be prepared by reacting the corresponding amine XI with chloro-acetyl chloride at room temperature or elevated temperature in a nonaqueous solvent in the presence of a base. Then the intermediate is reacted with a substituted amine.

As shown in scheme 15 intermediates of general formula (XVI) with a secondary (R′═H) or tertiary amine (R′=alkyl) can be prepared by reductive alkylation of the corresponding amine using an alkyl or aryl aldehyde and a reducing agend such as NaBH₄ or sodium triacetoxy borohydride at room temperature or elevated temperature in an appropriate solvent.

An alternative procedure to get compounds of formula (XVI) is by reductive alkylation of the corresponding cyclohexanone (XVII) using an alkyl or aryl amine and a reducing agend such as NaBH4 or sodium triacetoxy borohydride at room temperature or elevated temperature in an appropriate solvent as shown in scheme 16.

SYNTHESIS OF INTERMEDIATES Intermediate A.1 3,5-diamino-6-chloropyrazine-2-carboxylic acid

A mixture of methyl 3,5-diamino-6-chloropyrazine-2-carboxylate (100 g; 494 mmol), methanol (1 l) and NaOH (6 mol/l in water; 240 mL; 1.44 mol) is refluxed for 3 h. The mixture is allowed to cool to r.t. and then neutralized by addition of hydrochloric acid (6 mol/l in water; approx. 240 mL). Water (200 mL) is added. The precipitate formed is filtered off with suction, washed with water and dried at 60° C.

C₅H₅ClN₄O₂ ESI Mass spectrum: m/z=189 [M+H]⁺; m/z=187 [M−H]⁻

Intermediate A.2

3,5-Diamino-6-bromopyrazine-2-carboxylic acid is prepared from methyl 3,5-diamino-6-is bromopyrazine-2-carboxylate (which is prepared from methyl 3,5-diamino-6-chloropyrazine-2-carboxylate as described in J. Med. Chem. 10 (1967) 66-75) analogously to the procedure described for the synthesis of intermediate A.1

Intermediate B.1 1-(tert-Butylcarbamoyl)prop-1-en-2-yl 3,5-diamino-6-chloropyrazine-2-carboxylate

Stage 1:

A mixture of tert-butanol (21.0 mL; 226 mmol) and 5-methylisoxazole (18.0 mL; 221 mmol) is cooled with an ice-bath. Trifluoromethanesulphonic acid (20.0 mL; 221 mmol) is added dropwise with continued cooling. The resulting mixture is stirred for 1 h without further cooling.

Stage 2:

To a solution or suspension of 3,5-diamino-6-chloropyrazine-2-carboxylic acid (intermediate A.1; 14.0 g; 74.2 mmol) and triethylamine (31.0 mL; 222 mmol) in DMF (100 mL) is added the mixture prepared in stage 1. The resulting mixture is stirred for 4 h at r.t. Ice-water is added with stirring. The precipitate formed is filtered off with suction, washed with water and dried at 65° C. to yield the title compound.

C₁₃H₁₈ClN₅O₃ ESI Mass spectrum: m/z=328 [M+H]+; m/z=326 [M−H]⁻ TLC (Silica; DCM/MeOH 9:1): R_(f)=0.4

Intermediate B.2 1-(2-Methyl-2-butyl-carbamoyl)prop-1-en-2-yl 3,5-diamino-6-bromopyrazine-2-carboxylate

is Stage 1:

A mixture of 2-methyl-2-butanol (5.75 mL; 51 mmol) and 5-methylisoxazole (4.42 mL; 51 mmol) is cooled with an ice-bath. Trifluoromethanesulphonic acid (4.84 mL; 54 mmol) is added dropwise with continued cooling. The resulting mixture is stirred over night without further cooling.

Stage 2:

To a solution or suspension of 3,5-diamino-6-bromopyrazine-2-carboxylic acid (Intermediate A.2; 5.00 g; 21.5 mmol) and triethylamine (7.48 mL; 54 mmol) in DMF (50 mL) cooled with an ice-bath is added dropwise the mixture prepared in stage 1. The resulting mixture is stirred for 4 h at r.t., then poured on ice-water. The precipitate formed is filtered off with suction, washed with water and dried at 50° C. to yield the title compound.

C₁₄H₂₀BrN₅O₃ ESI Mass spectrum: m/z=386 [M+H]+; m/z=384 [M−H]⁻

Intermediate C.1 3,5-diamino-6-chloro-N-[(methylsulfanyl)methanimidoyl]pyrazine-2-carboxamide

To NaOH (1 mol/l in water; 9.2 mL; 9.2 mmol) is added S-methylisothiourea sulphate (1.78 g; 6.1 mmol. The mixture is stirred until complete solution is achieved. TBME/THF (1:1; 30 mL) and then 1-(tert-butylcarbamoyl)prop-1-en-2-yl 3,5-diamino-6-chloropyrazine-2-carboxylate (Intermediate B.1; 2.00 g; 6.10 mmol) are added and the mixture is stirred at r.t. over night, then water (6 mL) is added. The precipitate formed is filtered off with suction, washed successively with water, methanol and then with diethyl ether and then dried at 50° C. to yield the title compound.

C₇H₉ClN₆OS ESI Mass spectrum: m/z=261 [M+H]+; m/z=259 [M−H]⁻

Intermediate C.2 3,5-diamino-6-bromo-N-[(methylsulfanyl)methanimidoyl]pyrazine-2-carboxamide

To NaOH (1 mol/l in water; 30 mL; 30 mmol) is added S-methylisothiourea sulphate (5.42 g; 19.5 mmol. The mixture is stirred until complete solution is achieved. TBME/THF (1:1; 100 mL) and then 1-(2-methyl-2-butyl-carbamoyl)prop-1-en-2-yl 3,5-diamino-6-bromopyrazine-2-carboxylate (Intermediate B.2; 7.52 g; 19.5 mmol) are added and the mixture is stirred at r.t. over night, then water (100 mL) is added. The precipitate formed is filtered off with suction, washed with THF/water (1:2) and then dried at 50° C. to yield the title compound.

C₇H₉BrN₆OS ESI Mass spectrum: m/z=305 [M+H]+

Intermediate I.1

A mixture of trans-(4-methylamino-cyclohexyl)-carbamic acid tert-butylester (100.0 mg; 0.44 mmol), bromo-acetic acid methylester (46.0 μL; 0.49 mmol) and potassium carbonate (90.7 mg; 0.66 mmol) in ACN (1 mL) is stirred at r.t. over night. The insoluble material is filtered off and the solvent is removed. The residue is taken up in DCM and washed with water. The organic layer is separated and the solvent is removed. The residue is purified by RP HPLC (modifier: NH₃). The residue is taken up in TFA (50% in DCM) and stirred at r.t. for 1 hour. The solvent is removed.

C₁₀H₂₀N₂O₂*2C₂HF₃O₂

The following compounds are prepared accordingly using the respective amine and the halogenide as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

Inter- respective Respective Synthesis mediate amine halogenide comment I.2

trans-(4- amino- cyclohexyl)- carbamic acid tert-butylester

No purifi- cation by RP HPLC I.3

trans-(4- methylamino- cyclohexyl)- carbamic acid tert-butylester

No purifi- cation by RP HPLC

Intermediate II.1

Stage 1: A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (215.0 mg; 1.00 mmol) and methane sulfonyl chloride (85.8 μL; 1.10 mmol) in DCM (10 mL) is stirred at r.t. for 5 minutes. TEA (160.0 μL; 1.15 mmol) is added and the mixture is stirred at r.t. for 2 hours. The mixture is diluted with aqueous KHSO₄ (2M). The organic layer is separated and washed again with aqueous NaHCO₃ (half-saturated). The organic layer is separated and the solvent is removed.

C₁₂H₂₄N₂O₄S

Stage 2: Intermediate II.1 stage 1 (90.0 mg; 0.31 mmol) and TFA/DCM (2/1; 3 mL) is stirred at r.t. for 2 hours. The solvent is removed. The resulting residue is used without further purification.

C₇H₁₆N₂O₂S*C₂HF₃O₂

Intermediate III.1

A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (215.0 mg; 1.00 mmol) and TEA (160.0 μL; 1.15 mmol) in DCM (15 mL) is stirred at r.t. Methane sulfonyl chloride (85.8 μL; 1.10 mmol) is added and the mixture is stirred at r.t. for 2 hours. LiHMDS (1M in THF; 1.20 mL; 1.20 mmol) and bromo-acetic acid methyl ester (115.0 μL; 1.21 mmol) are added. The mixture is stirred at r.t. over night. The mixture is diluted with water and the organic layer is separated. The solvent is removed. The residue is taken up in TFA (25% in DCM) and stirred at r.t. for 4 hours. The solvent is removed.

C₁₀H₂₀N₂O₄S*C₂HF₃O₂

Intermediate IV.1a

A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (1.07 g; 5.00 mmol), bromo-acetic acid methy ester (535.8 μL; 5.66 mmol) and potassium carbonate (1.10 g; 7.97 mmol) in ACN (30 mL) is stirred at r.t. for 2 hours. Then another portion of potassium carbonate (1.10 g; 7.97 mmol) and bromo-acetic acid benzyl ester (860.0 μL; 5.50 mmol) are added. After stirring at r.t. over night insoluble material is filtered off. The residue is purified by RP HPLC (modifier: TFA). The residue is taken up in TFA (50% in DCM; 30 mL) and stirred at r.t. for 2 hour. The solvent is removed.

C₁₈H₂₆N₂O₄*2C₂HF₃O₂

Intermediate IV.1b

This molecule is a side product of the reaction described for intermediate IV.1a. It was obtained after chromatography and further removal of the protection group.

C₁₇H₃₀N₂O₆

Intermediate V.1

Stage 1: A mixture of Intermediate IV.1a (1.20 g; 2.76 mmol) and palladium on charcoal (200.0 mg) in methanol (50 mL) is hydrogenated in a Parr apparatus (r.t.; 50 psi; 3 hours). The catalyst is filtered off. The solvent is removed. The residue is stirred in diethyl ether, filtered off and dried.

C₁₆H₂₈N₂O₆

Stage 2: A mixture of Intermediate V.1 stage 1 (100.0 mg; 0.26 mmol), TBTU (90.0 mg; 0.28 mmol) and TEA (55.0 μL; 0.39 mmol) in DCM (3 mL) is stirred at r.t. for 30 minutes. N-Methylpiperazine (35.0 μL; 0.23 mmol) is added. After stirring for 4 hours the mixture is diluted with DCM and water. The organic layer is separated and evaporated. The residue is taken up in TFA (25% in DCM) and stirred at r.t. over night. The solvent is removed.

C₁₆H₃₀N₄O₃*3C₂HF₃O₂

The following compounds are prepared accordingly using the respective amine as indicates ed. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

Intermediate respective amine V.2

4-methylpiperidine V.3

thiomorpholine-1,1-dioxide

Intermediate VI.1

A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (200.0 mg; 0.93 mmol) and 4-fluoro-benzaldehyde (120.0 μL; 1.14 mmol) in methanol (5 mL) is stirred for 1 hour at reflux. The mixture is cooled to r.t. NaBH₄ (50.0 mg; 1.32 mmol) is added and the mixture is stirred at r.t. over night. Methyl iodide (70.0 μL) and DIPEA (240.0 μL; 1.40 mmol) are added. The mixture is stirred at r.t. for 4 hours. Additional methyl iodide (70.0 μL) is added. After stiffing over night once again methyl iodide (140.0 μL) and DIPEA (480 μL) is added. The mixture is stirred for 4 hours. The solvent is removed and the residue is purified by RP HPLC (modifier: NH₃). The residue is diluted in TFA (25% in DCM) and stirred at r.t. for 2 hours. The solvent is evaporated.

C₁₄H₂₁FN₂*2C₂HF₃O₂

The following compounds are prepared accordingly using the respective aldeyhde as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

Intermediate respective aldehyde VI.2

2-fluoro-benzaldehyde

Intermediate VII.1

A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (300.0 mg; 1.40 mmol) and TEA (290.0 μL; 2.09 mmol) in DCM (20 mL) is cooled in an ice bath. Chloroacetyl chloride (120.0 μL; 1.51 mmol) in DCM (10 mL) is added drop wise. The mixture is diluted with water. The organic layer is separated, dried and evaporated. The residue is taken up in THF and 1,4-dimethylpiperazine (1.00 mL; 7.39 mmol) is added. After stirring at 60° C. over night the mixture is purified by RP HPLC (modifier: TFA).

C₁₄H₂₉N₄O*2C₂HF₃O₂*C₂F₃O₂

Intermediate VIII.1

A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (150.0 mg; 0.70 mmol) and isopropyl isocyanate (65.5 mg; 0.77 mmol) in THF (10 mL) is stirred at r.t. for 1 hour. The solvent is removed and the residue is stirred in diethyl ether, filtered off and dried. The residue is diluted in TFA (25% in DCM) and stirred at r.t. over night. The solvent is evaporated.

C₁₀H₂₁H₂₁N₃O*2C₂HF₃O₂

ESI Mass spectrum: m/z=298 [M−H]−

The following compounds are prepared accordingly using the respective isocyanate as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

respective ESI Mass Intermediate isocyanate spectrum VIII.2

Cyclohexane isocyanate 340 (M + H)+

Intermediate IX.1

A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (150.0 mg; 0.70 mmol) and DIPEA (479.3 μL; 2.80 mmol) in DCM (10 mL) is stirred at r.t. for 5 minutes. Acetyl chloride (49.7 μL; 0.70 mmol) is added. After stiffing over night the mixture is diluted with water and DCM. The organic layer is separated and the solvent is removed. The residue is diluted in TFA (25% in DCM; 10 mL) and stirred at r.t. over night. The solvent is evaporated.

C₈H₁₆N₂O*C₂HF₃O₂

ESI Mass spectrum: m/z=157 [M+H]+

The following compounds are prepared accordingly using the respective chloride as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

respective Intermediate chloride Synthesis comment IX.2

isovaleryl chloride The resulting interme- diate is not purified by extraction, but by stirring in diethyl ether

Intermediate X.1

A mixture of N,N-dimethylglycine (62.6 mg; 0.61 mmol), HATU (230.6 mg; 0.61 mmol) and TEA (226.4 μL; 1.63 mmol) in DMF (3 mL) is stirred at r.t. for 45 minutes. trans-(4-Aminocyclohexyl)-carbamic acid tert-butylester (100.0 mg; 0.47 mmol) is added. After stirring for 1.5 hours the mixture is purified by RP HPLC (modifier: TFA). The solvent removed. The residue is diluted in TFA (25% in DCM; 6 mL) and stirred at r.t. over night. The solvent is evaporated.

C₁₀H₂₁N₃O*2C₂HF₃O₂

ESI Mass spectrum: m/z=200 [M+H]+

Intermediate XI.1

A mixture of trans-[4-(2-chloro-acetylamino)-cyclohexyl]-carbamic acid tert-butyl ester (150.0 mg; 0.52 mmol; prepared from trans-(4-aminocyclohexyl)-carbamic acid tert-butylester and chloro-acetyl chloride analogous to intermediate VII.1), 2-(2-hydroxyethylamino)ethanol (105.1 mg; 1.00 mol), potassium carbonate (276 mg; 2.00 mmol) and potassium iodide (20.0 mg; 0.12 mmol) in acetone (10 mL) is stirred at r.t. for 3 days. The insoluble material is filtered off and the solvent is removed. The residue is purified by silica gel chromatography (DCM/methanol 9/1). The solvent is removed. The residue is taken up in DCM. TFA (2 mL) is added. After stirring for 2 hours the solvent is removed.

C₁₂H₂₅N₃O₃*2C₂HF₃O₂

ESI Mass spectrum: m/z=260 [M+H]+

The following compounds are prepared accordingly using the respective amine as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

Inter- ESI medi- respective Synthesis Mass ate amine comment spectrum XI.2

(1-Methyl- [1,4]- diazepane no purifica- tion by chromatog- raphy XI.3

1-Methyl- piperazine 255 (M + H)+ XI.4

Piperidin- 4-ol no purifica- tion by chromatog- raphy 256 (M + H)+ XI.5

Dimethyl- piperidin- 4-yl-amine no purifica- tion by chromatog- raphy 283 (M + H)+ XI.6

Thiomor- pholine- 1,1-dioxide no purifica- tion by chromatog- raphy 290 (M + H)+ XI.7

Morpho- line no purifica- tion by chromatog- raphy 242 (M + H)+ XI.8

Trimethyl- amine (1M in THF) no purifica- tion by chromatog- raphy 214 (M + H)+ XI.9

Thiomor- pholine-1- oxide no purifica- tion by chromatog- raphy

Intermediate XII.1

Stage 1: A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (1.00 g; mmol), (2-bromo-ethyl)-dimethylamine hydrobromide (0.93 g; 3.99 mmol) and DIPEA (1.38 mL; 8.04 mmol) in ACN (16 mL) is stirred at 110° C. for 1 hour in a microwave. The insoluble material is filtered off and the solvent id removed. The residue is stirred in diethyl ether, filtered off and dried.

C₁₅H₃₁N₃O₂

ESI Mass spectrum: m/z=286 [M+H]+

Stage 2: A mixture of Intermediate XII.1 stage 1 (200.0 mg; 0.70 mmol) and TEA (97.7 μL; 0.70 mmol) in DCM (10 mL) is stirred at r.t. Methanesulfonyl chloride (54.3 μL; 0.70 mmol) is added drop wise. After stirring at r.t. over night the mixture is washed with water. The organic layer is separated and dried. TFA is added and stirred at r.t. for 1 hour. The solvent is evaporated.

C₁₁H₂₅N₃O₂S*2C₂HF₃O₂

The following compounds are prepared accordingly using the respective chloride as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

Inter- respective mediate chloride XII.2

Acetyl chloride

Intermediate XIII.1

Stage 1: A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (1.00 g; 4.67 mmol) bromo acetic acid methylester (0.88 mL; 9.33 mmol) and DIPEA (1.60 mL; 9.33 mmol) in DCM (50 mL) is stirred at r.t. over night. Another portion of bromo acetic acid methylester (440 μL) and DIPEA (0.8 mL) is added. After stirring for 15 hours the solvent is removed and the residue is purified by RP HPLC (modifier: TFA).

C₁₇H₃₀N₂O₆

ESI Mass spectrum: m/z=359 [M+H]+

Stage 2: A mixture of intermediate XIV.1 stage 1 (1.36 g; 3.79 mmol) and aqueous NaOH (1M; 7.60 mL; 7.60 mmol) in methanol (15 mL) is stirred at r.t. over night. Aqueous HCl (1M; 7.60 mL; 7.60 mmol) is added and the organic solvent is removed. The resulting precipitate is filtered off and dried.

C₁₅H₂₆N₂O₆

ESI Mass spectrum: m/z=331 [M+H]+

Stage 3: A mixture of intermediate XIII.1 stage 2 (300.0 mg; 0.91 mmol), dimethylpiperidin-4-yl-amine (291.4 μL; 2.00 mmol), HATU (759.6 mg; 2.00 mmol) and DIPEA (0.34 mL; 2.00 mmol) in DMF (6 mL) is stirred at r.t. for 3 days. The mixture is poured in water and extracted with DCM. The organic layer is separated, dried and the solvent is removed. The residue is purified by RP HPLC (modifier: TFA).

C₂₄H₄₆N₆O₂*4C₂HF₃O₂

ESI Mass spectrum: m/z=451 [M+H]+

The following compounds are prepared accordingly using the respective amine as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

respective Intermediate amine Synthesis comment XIII.2

1-methyl- piperazine The resulting amine is fil- tered through a PL-HCO₃— cartridge to yield the base

Intermediate XIV.1

Intermediate XII.1 stage 1 (200.0 mg; 0.70 mmol) and TFA (20% in DCM; 5 mL) are stirred at r.t. for 1 hour. The solvent is removed and the residue is further used as crude product.

C₁₀H₂₃N₃*3C₂HF₃O₂

Intermediate XV.1

Stage 1: Morpholine (0.50 mL; 5.74 mmol) and sulfuryl chloride (1.50 mL; 18.50 mmol) in ACN (5 mL) are stirred at reflux for 24 hours. The solvent is removed and the residue is taken up in toluene, treated with activated charcoal and filtered off. The solvent is removed.

C₄H₈ClNO₃S

Stage 2: A mixture of Intermediate XV.1 stage 1 (173.2 mg; 0.93 mmol) and trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (200.0 mg; 0.93 mmol) and DIPEA (171.2 μL; 1.00 mmol) in ACN (5 mL) is stirred at reflux for 8 hours. The solvent is removed. The residue is taken up in DCM and washed with water. The organic layer is separated and evaporated. The residue is taken up in TFA (3 mL) and stirred at r.t. for 2 hours. The solvent is removed.

C₁₀H₂₁N₃O₃S*C₂HF₃O₂

Intermediate XVI.1

Stage 1: Thiomorpholine-1,1-dioxide (3.00 g; 22.19 mmol) and DIPEA (3.80 mL; 22.19 mmol) in DCM (30 mL) is cooled in an ice bath. Chloro acetylchloride (1.77 mL; 22.19 mmol) is added drop wise. The mixture is stirred at r.t. for 3 hours. The organic solvent is washed with water. The organic layer is separated dried and the solvent is removed.

C₆H₁₀ClNO₃S

ESI Mass spectrum: m/z=212 [M+H]+

Stage 2: A mixture of intermediate XVI.1 stage 1 (304.7 mg; 1.42 mmol), trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (300.0 mg; 1.42 mmol) and potassium carbonate (597.6 mg; 4.32 mmol) in acetone (10 mL) is stirred at r.t. over night. The insoluble material is filtered off and the solvent is removed. The residue is purified by silica gel chromatography (DCM/methanol 9/1).

Two products are obtained.

Stage 2A: diacylated product:

-   -   Yield: 150.0 mg (19% of theory)     -   C₂₃H₄₀N₄O₈S₂     -   ESI Mass spectrum: m/z=565 [M+H]+         Stage 2B: monoacylated product:     -   Yield: 100.0 mg (18% of theory)     -   C₁₇H₃₁N₃O₅S     -   ESI Mass spectrum: m/z=390 [M+H]+

Stage 3: Intermediate XVI.1 stage 2A (150.0 mg; 0.27 mmol) and TFA (20% in DCM; 5 mL) are stirred at r.t. for 1 hour. The solvent is evaporated.

C₁₈H₃₂N₄O₆S₂*2C₂HF₃O₂

Intermediate XVII.1

Intermediate XVI.1 stage 2B (100.0 mg; 0.26 mmol) and TFA (20% in DCM; 5 mL) are stirred at r.t. for 1 hour. The solvent is evaporated.

C₁₂H₂₃N₃O₃S*2C₂HF₃O₂

Intermediate XVIII.1

Stage 1: A mixture of 4-(dibenzylamino) cyclohexanone (14.0 g; 47.72 mmol), 1-methylsulphonylpiperazine (8.50 g; 51.76 mmol) and sodium triacetoxy borohydride (17.50 g; 78.44 mmol) in DCM (250 mL) is stirred at r.t. for 4 hours. The mixture is diluted with water (200 mL) and potassium carbonate (20 g). The organic layer is separated, dried and the solvent is removed. The residue is purified by silica gel chromatography (ethyl acetate/methanol 9/1+1%>NH₃). The residue is stirred in diethyl ether and filtered off. The resulting cis-product was not isolated.

C₂₅H₃₅N₃O₂S

ESI Mass spectrum: m/z=442 [M+H]+

Stage 2: Intermediate XVIII.1 stage 1 (4.75 g; 10.76 mmol) and palladium on charcoal (10%; 2.00 g) in methanol (100 mL) are hydrogenated in a Parr apparatus (50° C.; 50 psi). The catalyst is filtered off and the solvent is removed. The residue is stirred in diethyl ether and filtered off.

C₁₁H₂₃N₃O₂S

ESI Mass spectrum: m/z=262 [M+H]+

Intermediate XIX.1

Stage 1: A mixture of 4-(dibenzylamino) cyclohexanone (29.3 g; 99.86 mmol), 1-phenylpiperazine (20.30 g; 125.12 mmol) and methanesulfonic acid (0.10 mL) in toluene (200 mL) is stirred at r.t. for 4 hours with Dean-Stark-apparatus. The resulting precipitate is filtered off and washed with toluene and ethanol. The solvent is evaporated. The residue is recrystallized from methanol.

Combined yield: 37.50 g (86% of theory)

C₃₀H₃₅N₃

Stage 2: Intermediate XIX.1 stage 1 (36.50 g; 83.40 mmol) is diluted in THF (400 mL) and ethanol (400 mL). NaBH₄ (8.00 g; 0.21 mmol) is added portion by portion. The mixture is stirred at reflux for 8 hours. THF is removed and the mixture is diluted with water (2 L). The resulting precipitate is filtered off and washed with water and ethanol. The residue is taken up in methanol (200 mL) and HCl (36%) is added till a pH of 2 is reached. The mixture is stirred in an ice bath for 30 minutes. The precipitate is filtered off and washed with methanol and diethyl ether.

C₃₀H₃₇N₃*2HCl

Stage 3: Intermediate XIX.1 stage 2 (21.60 g; 42.14 mmol) and palladium on charcoal (10%; 5.00 g) in methanol (500 mL) are hydrogenated in a Parr apparatus (50° C.; 50 psi). The catalyst is filtered off and the solvent is removed. The residue is crystallized from ethanol, filtered off and washed with ethanol and diethyl ether.

C16H25N3*2HCl

ESI Mass spectrum: m/z=260 [M+H]+

Intermediate XX.1

Stage 1: A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (200.0 mg; 0.93 mmol), methyl iodide (200.0 μL; 3.21 mmol) and potassium carbonate (445.0 mg; 3.22 mmol) in acetone (6 mL) and methanol (4 mL) is stirred at 50° C. for 10 minutes and then at r.t. over night. The insoluble material is filtered off and the solvent is removed.

C₁₄H₂₉N₂O₂*I

ESI Mass spectrum: m/z=257 [M+]

Stage 2: Intermediate XX.1 stage 1 (400.0 mg) and TFA (20% in DCM; 5 mL) are stirred at r.t. for 1 hour. The solvent is evaporated and the residue is further used as crude product.

C₉H₂₁N₂*I*C₂HF₃O₂

Intermediate XXI.1

Stage 1: A mixture of trans-(4-aminocyclohexyl)-carbamic acid tert-butylester (2.00 g; 9.33 mmol) and DIPEA (1.55 mL; 9.33 mmol) in DCM (20 mL) is cooled in an ice bath. Bromo-acetyl bromide (0.81 mL; 9.33 mmol) is added drop wise. The mixture is stirred at r.t. for 2 hours. The organic layer is washed with water, separated, dried and evaporated. The residue is stirred in diethyl ether, filtered off and dried.

C₁₃H₂₃BrN₂O₃

ESI Mass spectrum: m/z=333 [M−H]−

Stage 2: A mixture of Intermediate XXI.1 stage 1 (440.0 mg; 1.31 mmol) and (methoxycarbonylmethyl-amino)-acetic acid methyl ester hydrochloride (259.4 mg; 1.31 mmol), potassium iodide (21.8 mg; 0.13 mmol) and DIPEA (449.4 μL; 2.63 mmol) in DMF (2 mL) is stirred at 50° C. over night. The insoluble material is filtered off. The mother liquor is purified by RP HPLC (modifier: TFA).

C₁₉H₃₃N₃O₇

ESI Mass spectrum: m/z=416 [M+H]+

Stage 3: Intermediate XXI.1 stage 2 (370.0 mg; 0.89 mmol) and TFA (20% in DCM; 10 mL) are stirred at r.t. for 2 hours. The solvent is removed. The residue is taken up in methanolic HCl and evaporated.

C₁₄H₂₅N₃O₅*2HCl

ESI Mass spectrum: m/z=316 [M+H]+

Intermediate XXII.1

A mixture of bromo acetic acid (351.5 mg; 2.53 mmol), (methoxycarbonylmethyl-amino)acetic acid methyl ester hydrochloride (500.0 mg; 2.53 mmol), potassium carbonate (1.04 g; 7.50 mmol) and potassium iodide (50.0 mg; 0.30 mmol) in acetone (10 mL) is stirred at r.t. for 3 days. The insoluble material is filtered off and discarded. The solvent is evaporated.

C₈H₁₃NO₆

Intermediate XXIII.1

A mixture of cis-(4-aminocyclohexyl)-carbamic acid tert-butylester (320.0 mg; 1.49 mmol) and formaldehyde (37% in water; 160.0 μL; 2.14 mmol) in methanol (5 mL) is stirred at r.t. for 15 minutes. NaBH₄ (53.8 mg; 2.24 mmol) is added. After 30 minutes of stirring further formaldehyde (160.0 μL) is added and stirred for another 20 minutes. NaBH₄ (53.8 mg) is added and the mixture is stirred at r.t. over night. The solvent is evaporated. The residue is taken up in DCM/methanol (19/1) and washed with NaOH (1M). The organic layer is separated, dried and the solvent is removed. The residue is taken up in DCM and TFA (25% in DCM). After 4 hours of stiffing at r.t. the solvent is evaporated.

C₈H₁₈N₂*2C₂HF₃O₂

SYNTHESIS OF EXAMPLES Example 1.1

A mixture of intermediate C.1 (70.0 mg; 0.27 mmol) and intermediate 1.1 (98.5 mg; 0.23 mmol) in THF (2 mL) is stirred at 70° C. for 3 days. The solvent is removed and the residue is purified by RP HPLC (modifier: TFA). The residue is taken up in methanolic HCL and the solvent is evaporated.

C₁₆H₂₅ClN₈O₃*2HCl

ESI Mass spectrum: m/z=413 [M+H]+

HPLC analytics: RT=0.69 min (HPLC method A)

The following compounds of Table I are prepared accordingly using the respective amine and the respective thiourea as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

TABLE 1

HPLC Retent ten- ESI tion HPLC respective Synthesis Mass time meth- Example R amine comment spectrum (min) od 1.2

(4-amino- cyclohexyl)- carbamic acid tert- butylester Purification by RP HPLC (modifier: NH₃) 427 (M + H)+ 1.08 A 1.3

Intermediate II.1 405 (M + H)+ 0.86 A 1.4

Intermediate III.1 477 (M + H)+ 0.94 A 1.5

Intermediate I.2 399 (M + H)+ 0.69 A 1.6

Intermediate I.3 431 (M + H)+ 0.84 A 1.7

Intermediate IV.1a 547 (M + H)+ 1.17 A 1.8

Intermediate IV.1b 471 (M + H)+ 0.91 A 1.9

Intermediate V.1 539 (M + H)+ 0.71 A 1.10

Intermediate V.2 538 (M + H)+ 0.95 A 1.11

Intermediate V.3 574 (M + H)+ 0.77 A 1.12

Intermediate VI.2 449 (M + H)+ 0.87 A 1.13

Intermediate VI.1 449 (M + H)+ 1.25 B 1.14

Intermediate VII.1 481 M+ 0.50 C 1.15

4- Dimethyl- amino cyclo- hexyl amin 355 (M + H)+ 0.68 A 1.16

1-N-Boc-cis- 1,4- cyclohexyl- diamine 427 (M + H)+ 1.16 A 1.17

1-N-Boc-cis- 1,4- cyclohexyl- diamine Deprotec- tion of the amine by TFA (25% in DCM) 327 (M + H)+ 0.64 A 1.18

(4-amino- cyclohexyl)- carbamic acid benzyl ester 461 (M + H)+ 1.55 D 1.19

Intermediate VIII.1 Purification by RP HPLC (modifier: NH₃) 412 (M + H)+ 1.40 D 1.20

Intermediate VIII.2 Purification by RP HPLC (modifier: NH₃) 452 (M + H)+ 1.08 D 1.21

Intermediate IX.1 369 (M + H)+ 1.17 A 1.22

Intermediate IX.2 411 (M + H)+ 1.06 A 1.23

Intermediate X.1 412 (M + H)+ 0.75 A 1.24

4-morpholin- 4-yl- cyclohexyl- amine 397 (M + H)+ 1.67 A 1.25

4-(4-methyl- piperazin-1- yl)- cyclohexyl- amine 410 (M + H)+ 0.64 A 1.26

Intermediate XI.1 472 (M + H)+ 0.49 F 1.27

Intermediate XI.2 481 (M + H)+ 0.48 G 1.28

Intermediate XI.3 467 (M + H)+ 0.74 + 0.76 A 1.29

Intermediate XII.1 476 (M + H)+ 0.52 G 1.30

Intermediate XII.2 440 (M + H)+ 0.53 G 1.31

Intermediate XIII.1 Purification by RP HPLC (modifier: NH₃) 663 (M + H)+ 0.66 F 1.32

Intermediate XIII.2 Purification by RP HPLC (modifier: NH₃) 607 (M + H)+ 0.58 F 1.33

Intermediate XIV.1 Purification by RP HPLC (modifier: NH₃) 398 (M + H)+ 0.61 F 1.34

Intermediate XV.1 476 (M + H)+ 0.96 A 1.35

Intermediate XVI.1 Purification by RP HPLC (modifier: NH₃) 677 (M + H)+ 0.51 G 1.36

Intermediate XVII.1 502 (M + H)+ 0.55 F 1.37

Intermediate XVIII.1 474 (M + H)+ 0.7  A 1.38

Intermediate XIX.1 472 (M + H)+ 0.89 A 1.39

Intermediate XX.1 369 (M+) 0.64 A 1.40

Intermediate XI.4 468 (M + H)+ 0.75 A 1.41

Intermediate XI.5 495 (M + H)+ 0.70 A 1.42

Intermediate XI.6 502 (M + H)+ 0.87 A 1.43

Intermediate XI.7 454 (M + H)+ 0.76 A 1.44

Intermediate XI.8 426 (M+) 0.77 A 1.45

Intermediate XI.9 486 (M + H)+ 0.75 A 1.46

Intermediate XXI.1 528 (M + H)+ 0.62 G 1.47

Intermediate XXIII.1 355 (M + H)+ 0.65 A

Example 2.1

A mixture of example 1.46 (75.0 mg; 0.14 mmol) and NaOH (1M; 0.28 mL; 0.28 mmol) in methanol (6 mL) is stirred at 50° C. for 5 hours and at r.t. over night. The solvent is removed. The residue is purified by RP HPL C (modifier: TFA).

Yield: 9.0 mg (13% of theory)

C₁₈H₂₆ClN₉O₆

ESI Mass spectrum: m/z=500 [M+H]+

HPLC analytics: RT=0.56 min (HPLC method G)

The following compounds of Table 2 are prepared accordingly using the respective ester as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

TABLE 2

ESI HPLC Re- Mass Reten- HPLC Exam- spective Synthesis spec- tion time meth- ple R ester comment trum (min) od 2.2

Exam- ple 5.1 Use of TFA (20% in DCM) for hydrolysis 475 (M + H)+ 1.07 A 2.3

Exam- ple 1.11 560 (M + H)+ 0.70 A 2.4

Exam- ple 1.9 525 (M + H)+ 0.61 A 2.5

Exam- ple 1.10 524 (M + H)+ 0.93 A 2.6

Exam- ple 1.4 463 (M + H)+ 0.67 G 2.7

Exam- ple 1.5 385 (M + H)+ 0.66 G 2.8

Exam- ple 1.1 399 (M + H)+ 0.42 A

Example 3.1

A mixture of Example 1.28 (70.0 mg; 0.12 mmol), methyl iodide (7.5 μL; 0.12 mmol) and DIPEA (62.1 μL; 0.36 mmol) in acetone (6 mL) is stirred at r.t. over night. The resulting precipitate is filtered off and washed with diethyl ether.

Yield: 28.0 mg (38% of theory)

C₂₀H₃₄ClN₁₀O₂*I

ESI Mass spectrum: m/z=481 [M+]

HPLC analytics: RT=0.76 min (HPLC method A)

The following compounds of Table 3 are prepared accordingly using the respective amine as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

TABLE 3

HPLC Re- ESI Reten- spec- Mass tion HPLC Exam- tive Synthesis spec- time meth- ple R amine comment trum (min) od 3.2

Exam- ple 1.31 No use of DIPEA; purifica- tion by RT HPLC (modifier: TFA) 346 (M + H)+ + 0.49 G 3.3

Exam- ple 1.32 No use of DIPEA; purifica- tion by RP HPLC (modifier: TFA) 318 (M + H)+ + 0.44 G 3.4

Exam- ple 1.27 No use of DIPEA 496 (M + H)+ 0.51 G

Example 4.1

A mixture of Example 6.2 (300.0 mg; 0.54 mmol), (3-chloro-propyl)-dimethyl-amine hydrochloride (85.5 mg; 0.54 mmol) and potassium carbonate (224.2 mg; 1.62 mmol) in DMF (5 mL) is stirred at r.t. over night. The insoluble material is filtered off and the solvent is removed. The residue is purified by RP HPLC (modifier: TFA).

Yield: 23.0 mg (9% of theory)

C₁₇H₃₀ClN₉O*2HCl

ESI Mass spectrum: m/z=412 [M+H]+

HPLC analytics: RT=0.64 min (HPLC method F)

The following compounds of Table 4 are prepared accordingly using the respective halogenide as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

TABLE 4

Respective Synthesis ESI Mass HPLC HPLC Example R halogenide comment spectrum Retention method 4.2

Solvent used is ACN; purifica- tion by RP HPLC (modifier: NH₃) 454 (M + H)+ 0.54 F

Example 5.1

A mixture of terephalic acid mono tert-butylester (60.0 mg; 0.27 mmol), HATU (90.0 mg; 02.4 mmol) and TEA (130.0 μL; 0.94 mmol) in DMF (1 mL) is stirred at r.t. for 20 minutes. Example 6.2 (110.0 mg; 0.20 mmol) is added. After stiffing at r.t. over night the mixture is purified by RP HPLC (Modifier: TFA).

Yield: 57.0 mg (45% of theory)

C₂₄H₃₁ClN₈O₄*C₂HF₃O₂

ESI Mass spectrum: m/z=531 [M+H]+

HPLC analytics: RT=1.29 min (HPLC method A)

The following compounds of Table 5 are prepared accordingly using the respective amine and the respective acid as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

TABLE 5

Respective Synthesis ESI Mass HPLC Reten- Example R amine Respective acid comment spectrum tion time (min) HPLC method 5.2

Ex- ample 6.2

Use of DIPEA, instead of TEA 498 (M + H)+ 0.67 G 5.3

Ex- ample 6.2

Use of DIPEA, instead of TEA; purifi- cation by RP 466 (M + H)+ 0.55 F HPLC (modi- fier: NH₃) 5.4

Ex- ample 6.2 Intermediate XXV.1/HATU (Side reaction with HATU) Use of DIPEA, instead of TEA 425 (M +) 0.52 G 5.5

1- Meth- yl- piper- azine Example 2.7 Use of DIPEA, instead of TEA; use of 467 (M + H)+ 0.55 F TBTU instead of HATU

Example 6.1

A mixture of Example 5.2 (14.0 mg; 0.03 mmol) and TFA (10% in DCM; 3 mL) is stirred at r.t. over night. The solvent is removed.

The following compounds of Table 6 are prepared accordingly using the respective protected amine as indicated. Due to conditions applied, the synthesis may yield a free base, a hydrochloride or dihydrochloride salt, a zwitterion or other salt forms which can be applied equally to the syntheses of example compounds as described above.

TABLE 6

Respective HPLC Re- protected ESI Mass tention HPLC Example R amine Synthesis comment spectrum time (min) method 6.2 NH2 Example 1.2 The residue is stirred 327 = 0.46 G in diethyl ether, filtered (M + H)+ off, dried. Taken- up in methanolic HCl and the solvent is removed

Yield: 15.0 mg (100% of theory)

C₁₅H₂₄ClN₉O₂*C₂HF₃O₂

ESI Mass spectrum: m/z=398 [M+H]+

HPLC analytics: RT=0.51 min (HPLC method G)

Example 7

A mixture of example 6.2 (70.0 mg; 0.16 mmol), 1H-1,2,4-triazole-1-carboxamidine hydrochloride (23.6 mg; 0.16 mmol) and DIPEA (20.7 mg; 0.16 mmol) in ethanol (3 mL) is stirred at 70° C. for 3 hours. The mixture is purified by RP HPLC (modifier: TFA). The residue is taken up in diethyl ether and the solvent is removed.

Yield: 26.0 mg (34% of theory)

C₁₃H₂₁ClN₁₀O*C₂HF₃O₂

ESI Mass spectrum: m/z=369 [M+H]+

HPLC analytics: RT=0.77 min (HPLC method A)

Example 8

A mixture of Example 6.2 (160.0 mg; 0.36 mmol), 4-methyl-piperazine-1-sulfonyl chloride hydrochloride (120.0 mg; 0.51 mmol) and DABCO (diazabicyclo-octan; 220.0 mg; 1.96 mmol) in DCM (5 mL) is stirred at r.t. over night. The insoluble material is filtered off and the solvent is removed. The residue is purified by RP HPLC (modifier: TFA). The residue is taken up in diethyl ether, filtered off and dried.

Yield: 27.0 mg (12% of theory)

C₁₇H₂₉ClN₁₀O₃S*C₂HF₃O₂

ESI Mass spectrum: m/z=489 [M+H]+

HPLC analytics: RT=0.52 min (HPLC method G)

Analytical Methods and Preparative Chromatography

As a rule, ¹H-NMR and mass spectra have been obtained for the compounds prepared. Mass peaks given (e.g. (M+H)+; (M+HCOO)—) refer to monoisotopic molecular weight. R_(f) values from TLC are determined using ready-made silica gel 60 TLC plates F₂₅₄ (E. Merck, Darmstadt, Item no. 1.05714) without chamber saturation or using ready-made aluminium oxide 60 F₂₅₄ TLC plates (E. Merck, Darmstadt, Item no. 1.05713) without chamber saturation. The ration given for the eluents relate to units by volume of the solvent in question. The units by volume for NH₃ relate to a concentrated solution of NH₃ in water. For silica gel chromatographic purifications, silica gel made by Millipore (MATREX™, 35-70 my) is used.

Analytical HPLC/MS Methods

The HPLC retention times given are measured under the following parameters. Unless a temperature value is given, the system is run at r.t.

HPLC Method A

Column SunFire C18 3 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% TFA] [methanol] [mL/min] [° C.] 0.00 95 5 1.8 60 0.25 95 5 1.8 60 1.70 0 100 1.8 60 1.75 0 100 2.5 60 1.90 0 100 2.5 60

HPLC Method B

Column XBridge C18 4.6 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% TFA] [methanol] [mL/min] [° C.] 0.00 95 5 4.0 60 0.05 95 5 3.0 60 2.05 0 100 3.0 60 2.10 0 100 4.5 60 2.40 0 100 4.5 60

HPLC Method C

Column XBridge C18 3 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% TFA] [methanol] [mL/min] [° C.] 0.00 97 3 2.2 60 0.20 97 3 2.2 60 1.20 0 100 2.2 60 1.25 0 100 3.0 60 1.40 0 100 3.0 60

HPLC Method D

Column SunFire C18 4.6 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% TFA] [methanol] [mL/min] [° C.] 0.00 95 5 4.0 60 0.05 95 5 3.0 60 2.05 0 100 3.0 60 2.10 0 100 4.5 60 2.40 0 100 4.5 60

HPLC Method E

Column XBridge C18 3 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% NH₃] [methanol] [mL/min] [° C.] 0.00 95 5 2.2 60 0.30 95 5 2.2 60 1.50 0 100 2.2 60 1.55 0 100 2.9 60 1.70 0 100 2.9 60

HPLC Method F

Column XBridge C18 3 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% NH₃] [acetonitrile] [mL/min] [° C.] 0.00 97 3 2.2 60 0.20 97 3 2.2 60 1.20 0 100 2.2 60 1.25 0 100 3.0 60 1.40 0 100 3.0 60

HPLC Method G

Column SunFire 3 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% NH₃] [acetonitrile] [mL/min] [° C.] 0.00 97 3 2.2 60 0.20 97 3 2.2 60 1.20 0 100 2.2 60 1.25 0 100 3.0 60 1.40 0 100 3.0 60

HPLC Method H

Column XBridge C18 3 × 30 mm, 2.5 μm (Waters) Gradient time % Sol [H₂O, % Sol Flow Temp [min] 0.1% NH₃] [methanol] [mL/min] [° C.] 0.00 95 5 2.2 60 0.30 95 5 2.2 60 1.50 0 100 2.2 60 1.55 0 100 2.9 60 1.65 0 100 2.9 60

Preparative HPLC/MS Methods

The compounds are, if not stated otherwise, purified by RP HPLC.

Columns used are SunFire C18 or XBridge C18 from Waters. Modifiers applied are TFA or NH₃ as indicated.

Permeability and Efflux in CALU-3 Cells:

Permeability measurements across polarized, confluent CALU-3 cell monolayers grown on permeable filter supports are used to provide information on the potential of a compound to pass the lung epithelium. Apparent permeability coefficients (Papp) of the compounds across the CALU-3 cell monolayers are measured (pH 7.4, 37° C.) in apical-to-basal (AB) and basal-to-apical (BA) transport direction. AB permeability (Papp, AB) represents drug absorption from the lung lumen into the blood and BA permeability (Papp, BA) drug transport from the blood into the lung lumen mainly via passive permeability since Calu-3 cells as well as lung epithelial cells do not express efflux transporters like P-gp, while uptake transporters may be expressed.

CALU-3 cells (1-2×10⁵ cells/1 cm² area) are seeded on filter inserts (Costar transwell polycarbonate filters, 0.4 μm pore size) and cultured (DMEM) for 10-12 days until tight monolayers are formed. Compounds of interest are dissolved in appropriate solvent (DMSO, 10 mM stock solution). Stock solutions are diluted with HTP-4 buffer (128.13 mM NaCl, 5.36 mM KCl, 1 mM MgSO4, 1.8 mM CaCl₂, 4.17 mM NaHCO3, 1.19 mM Na2HPO4×7H2O, 0.41 mM NaH2PO4×H2O, 15 mM HEPES, 20 mM glucose, 0.25% BSA, pH 7.4) to prepare the transport solutions (10 μM compound, final DMSO <=0.5%). The transport solution (TL) is applied to the apical or basolateral donor side for measuring A-B or B-A permeability (3 filter replicates), respectively. The receiver side contains the same buffer as the donor side. After 30 min of accommodation, samples are collected at the start t0=0 min and at the end of the experiment tn=90 min from the donor and at 0, 30, 60, and 90 min also from the receiver chamber. Volume removed is replenished by HTP-4 buffer. The compound concentration in the samples is measured by HPLC-MS/MS or scintillation counting. The permeability coefficient (Papp) and efflux ratio are calculated according to:

Papp [cm/s]=(concentration receiver [nM]*volume receiver [mL]/time interval [sec])*(1/filter area)*(1/donor concentration [nM])

Efflux ratio or Uptake ratio=Papp,BA/Papp,AB

Example 1.3 1.4 1.15 1.5 1.23 3.1 1.42 1.45 1.11 P BA 7.15 4.95 <2.73 7.59 1.93 2.29 3.64 5.57 3.81 [cm/sec] E−07 E−07 E−07 E−07 E−07 E−07 E−07 E−07 E−07

Example 1.9 1.13 2.2 5.2 6.1 8 1.14 1.26 1.27 P BA 1.02 7.53 2.31 4.21 2.25 3.54 3.16 6.50 5.30 [cm/sec] E−07 E−06 E−07 E−07 E−07 E−07 E−07 E−07 E−07

Example 1.30 1.29 1.33 1.36 1.35 4.2 5.3 5.5 5.4 P BA 3.26 5.19 <6.30 <3.22 <9.78 3.14 3.02 2.60 2.13 [cm/sec] E−07 E−07 E−07 E−07 E−08 E−07 E−07 E−07 E−07

Example 3.4 4.1 1.32 3.3 1.31 6.2 P BA 1.23 <2.72 <9.81 <3.75 1.35 <2.72 [cm/sec] E−07 E−06 E−07 E−06 E−06 E−07

The following abbreviations are used above and hereinafter:

-   ACN Acetonitrile -   BOC tert-Butoxycarbonyl -   DCM Methylene chloride -   DIPEA Diisopropyl-ethylamine -   DMF N,N-Dimethylformamide -   DPPF 1,1′-Bis(diphenylphosphino)ferrocene -   ESI Electrospray ionization -   h hour -   HATU     O-(7-Azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium-hexafluorophosphate -   HCl Hydrochloric acid -   LiHMDS Lithium bis(trimethylsilyl)amide -   MeOH methanol -   Min minutes -   Mp melting point -   NaOH aqueous sodium hydroxide solution -   n.d. not determined -   Pd/C palladium on charcoal -   r.t. ambient temperature (about 20° C.) -   RT retention time -   TBME Methyl tert-butyl ether -   TBTU     2-(1H-Benzotriazol-1-yl)-1,1,3,3-tetramethyluronium-tetrafluoroborate -   TEA Triethylamine -   TFA Trifluoroacetic acid -   THF Tetrahydrofuran -   TMS Trimethylsilyl

-    arrow and asterisk indicate the binding site, i.e. the point of     attachment (here: atom “A”) within a chemical entity (here     exemplified by the group “A-R”)

Pharmacological Test Method:

Other features and advantages of the present invention will become apparent from the following more detailed examples which illustrate, by way of example, the principles of the invention.

Ussing Chamber: Mouse kidney M-1 cells were cultivated in DMEM containing 5% FCS and 5 μM dexamethasone for 10 to 12 days on polyester transwell filters. Filters were inserted into a teflon-coated well-plate which fit into the ussing chamber system. Prior to measurement the medium of M-1 cells was replaced with Caco-2 transport buffer (Invitrogen, Germany). During measurements, the Ussing chamber temperature was kept at 37° C. Short circuit currents (I_sc) were measured in the voltage-clamp mode using an amplifier with the software package Lab View for data acquisition and analysis. The transepithelial electrical resistance (TEER) was determined by the application of voltage steps of ±5 mV every 5 sec. Compounds were administered at a final concentration of 3 μM or at increasing concentrations (e.g. 1-3-10 μM) to the apical solution. At the end of each experiment the amiloride sensitive I_SC was measured by adding 3 μM amiloride to the apical compartment. Results are expressed as inhibition in percent of the amiloride effect or as IC50.

With the example compounds given above, the following IC50 values given in Table 1 were determined in the Ussing Chamber assay:

TABLE 1 Ussing Ussing Ussing Chamber Chamber Chamber Example IC50 [μM] Example IC50 [μM] Example IC50 [μM] 1.2 0.010 1.24 0.008 7 0.010 1.3 0.009 1.28 0.042 1.34 0.015 1.4 0.021 1.39 0.056 1.17 0.248 1.15 0.011 3.1 0.025 1.16 0.002 1.47 0.599 1.20 0.006 1.10 0.015 1.1 0.007 1.40 0.019 1.11 0.011 1.6 0.004 1.41 0.022 1.9 0.015 1.5 0.007 1.43 0.017 2.5 0.079 1.21 0.032 1.19 0.024 2.4 0.235 1.23 0.018 1.42 0.019 1.13 0.007 1.18 0.007 1.44 0.028 2.3 0.166 2.8 0.035 2.7 0.036 5.1 0.010 1.22 0.011 1.8 0.016 2.2 0.015 1.37 0.014 1.7 0.006 1.12 0.008 1.38 0.012 2.6 0.291 5.2 0.046 1.25 0.017 1.45 0.033 6.1 0.034 8 0.025 1.36 0.014 4.1 0.031 1.14 0.037 1.35 0.010 1.32 0.063 1.26 0.013 4.2 0.007 3.3 0.044 1.46 0.041 5.3 0.013 1.31 0.056 1.27 0.013 5.5 0.013 3.2 0.059 1.30 0.030 5.4 0.039 6.2 0.006 1.29 0.029 3.4 0.017 1.33 0.010 2.1 0.304

Combinations

The compounds of formula (I) may be used on their own or in conjunction with other active substances of (I) according to the invention. If desired the compounds of formula (I) may also be used in combination with other pharmaceutically active substances. Therefore the invention further relates to medicament combinations which preferably contain, besides one or more compounds of formula (I), as further active substances, one or more compounds selected from among the categories of further ENaC inhibitors, betamimetics, anticholinergics, corticosteroids, PDE4-inhibitors, LTD4-antagonists, EGFR-inhibitors, dopamine agonists, H1-antihistamines, PAF-antagonists, MAP-kinase inhibitors, MPR4-Inhibitors, iNOS-Inhibitors, SYK-Inhibitors, corrections of the cystic fibrosis transmembrane regulator (CFTR) and CFTR potentiators, or double or triple combinations thereof.

Indications

As has been found, the compounds of formula (I) are characterised by their wide range of applications in the therapeutic field. Particular mention should be made of those applications for which the compounds according to the invention of formula (I) are preferably suited on account of their pharmaceutical efficacy as ENaC inhibitors. Examples include respiratory diseases or complaints, or allergic diseases of the airways,

Particular mention should be made of the prevention and treatment of diseases of the airways and of the lung which are accompanied by increased mucus production, inflammations and/or obstructive diseases of the airways. Examples include acute, allergic or chronic bronchitis, chronic obstructive bronchitis (COPD), coughing, pulmonary emphysema, allergic or non-allergic rhinitis or sinusitis, chronic rhinitis or sinusitis, asthma, alveolitis, Farmer's disease, hyperreactive airways, infectious bronchitis or pneumonitis, pediatric asthma, bronchiectases, pulmonary fibrosis, ARDS (acute adult respiratory distress syndrome), bronchial oedema, pulmonary oedema, bronchitis, pneumonia or interstitial pneumonia triggered by various causes, such as aspiration, inhalation of toxic gases, or bronchitis, pneumonia or interstitial pneumonia as a result of heart failure, irradiation, chemotherapy, cystic fibrosis or mucoviscidosis, or alpha1-antitrypsin deficiency.

Particularly preferably the present invention relates to the use of compounds of formula (I) for preparing a pharmaceutical composition for the treatment of inflammatory or obstructive diseases of the upper and lower respiratory tract including the lungs, such as for example allergic rhinitis, chronic rhinitis, bronchiectasis, cystic fibrosis, COPD, chronic bronchitis, chronic sinusitis, asthma, particularly COPD, chronic bronchitis and asthma.

It is most preferable to use the compounds of formula (I) for the treatment of inflammatory and obstructive diseases such as COPD, chronic bronchitis, chronic sinusitis, asthma, cystic fibrosis, particularly COPD, chronic bronchitis and asthma and cystic fibrosis.

The actual pharmaceutically effective amount or therapeutic dosage will of course depend on factors known by those skilled in the art such as age and weight of the patient, route of administration and severity of disease. In any case the combination will be administered at dosages and in a manner which allows a pharmaceutically effective amount to be delivered based upon patient's unique condition.

Formulations

Suitable forms for administration are for example inhalable powders or aerosols. The content of the pharmaceutically effective compound(s) in each case should be in the range from 0.2 to 50 wt %, preferably 5 to 25 wt. % of the total composition, i.e. in amounts which are sufficient to achieve the dosage range specified hereinafter.

Administered by inhalation the active substance combination may be given as a powder, as an aqueous or aqueous-ethanolic solution or using a propellant gas formulation.

Preferably, therefore, pharmaceutical formulations are characterised in that they contain one or more compounds of (I) according to the preferred embodiments above. It is also preferred if the compounds of formula (I) are administered by inhalation, particularly preferably if they are administered once or twice a day. For this purpose, the compounds of formula (I) have to be made available in forms suitable for inhalation. Inhalable preparations include inhalable powders, propellant-containing metered-dose aerosols or propellant-free inhalable solutions, which are optionally present in admixture with conventional physiologically acceptable excipients.

Within the scope of the present invention, the term propellant-free inhalable solutions also include concentrates or sterile ready-to-use inhalable solutions. The preparations which may be used according to the invention are described in more detail in the next part of the specification.

Inhalable Powders

If the active substances of formula (I) are present in admixture with physiologically acceptable excipients, the following physiologically acceptable excipients may be used to prepare the inhalable powders according to the invention: monosaccharides (e.g. glucose or arabinose), disaccharides (e.g. lactose, saccharose, maltose), oligo- and polysaccharides (e.g. dextran), polyalcohols (e.g. sorbitol, mannitol, xylitol), salts (e.g. sodium chloride, calcium carbonate) or mixtures of these excipients with one another. Preferably, mono- or disaccharides are used, while the use of lactose or glucose is preferred, particularly, but not exclusively, in the form of their hydrates. For the purposes of the invention, lactose is the particularly preferred excipient, while lactose monohydrate is most particularly preferred. Methods of preparing the inhalable powders according to the invention by grinding and micronising and by finally mixing the components together are known from the prior art.

Propellant-Containing Inhalable Aerosols

The propellant-containing inhalable aerosols which may be used according to the invention may contain a compound of formula (I) dissolved in the propellant gas or in dispersed form. The propellant gases which may be used to prepare the inhalation aerosols according to the invention are known from the prior art. Suitable propellant gases are selected from among hydrocarbons such as n-propane, n-butane or isobutane and halohydrocarbons such as preferably fluorinated derivatives of methane, ethane, propane, butane, cyclopropane or cyclobutane. The propellant gases mentioned above may be used on their own or in mixtures thereof. Particularly preferred propellant gases are fluorinated alkane derivatives selected from TG134a (1,1,1,2-tetrafluoroethane), TG227 (1,1,1,2,3,3,3-heptafluoropropane) and mixtures thereof. The propellant-driven inhalation aerosols used within the scope of the use according to the invention may also contain other ingredients such as co-solvents, stabilisers, surfactants, antioxidants, lubricants and pH adjusters. All these ingredients are known in the art.

Propellant-Free Inhalable Solutions

The compounds of formula (I) according to the invention are preferably used to prepare propellant-free inhalable solutions and inhalable suspensions. Solvents used for this purpose include aqueous or alcoholic, preferably ethanolic solutions. The solvent may be water on its own or a mixture of water and ethanol. The solutions or suspensions are adjusted to a pH of 2 to 7, preferably 2 to 5, using suitable acids. The pH may be adjusted using acids selected from inorganic or organic acids. Examples of particularly suitable inorganic acids include hydrochloric acid, hydrobromic acid, nitric acid, sulphuric acid and/or phosphoric acid. Examples of particularly suitable organic acids include ascorbic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, fumaric acid, acetic acid, formic acid and/or propionic acid etc. Preferred inorganic acids are hydrochloric and sulphuric acids. It is also possible to use the acids which have already formed an acid addition salt with one of the active substances. Of the organic acids, ascorbic acid, fumaric acid and citric acid are preferred. If desired, mixtures of the above acids may also be used, particularly in the case of acids which have other properties in addition to their acidifying qualities, e.g. as flavourings, antioxidants or complexing agents, such as citric acid or ascorbic acid, for example. According to the invention, it is particularly preferred to use hydrochloric acid to adjust the pH.

Co-solvents and/or other excipients may be added to the propellant-free inhalable solutions used for the purpose according to the invention. Preferred co-solvents are those which contain hydroxyl groups or other polar groups, e.g. alcohols—particularly isopropyl alcohol, glycols—particularly propyleneglycol, polyethyleneglycol, polypropyleneglycol, glycolether, glycerol, polyoxyethylene alcohols and polyoxyethylene fatty acid esters. The terms excipients and additives in this context denote any pharmacologically acceptable substance which is not an active substance but which can be formulated with the active substance or substances in the pharmacologically suitable solvent in order to improve the qualitative properties of the active substance formulation. Preferably, these substances have no pharmacological effect or, in connection with the desired therapy, no appreciable or at least no undesirable pharmacological effect. The excipients and additives include, for example, surfactants such as soya lecithin, oleic acid, sorbitan esters, such as polysorbates, polyvinylpyrrolidone, other stabilisers, complexing agents, antioxidants and/or preservatives which guarantee or prolong the shelf life of the finished pharmaceutical formulation, flavourings, vitamins and/or other additives known in the art. The additives also include pharmacologically acceptable salts such as sodium chloride as isotonic agents. The preferred excipients include antioxidants such as ascorbic acid, for example, provided that it has not already been used to adjust the pH, vitamin A, vitamin E, tocopherols and similar vitamins or provitamins occurring in the human body. Preservatives may be used to protect the formulation from contamination with pathogens. Suitable preservatives are those which are known in the art, particularly cetyl pyridinium chloride, benzalkonium chloride or benzoic acid or benzoates such as sodium benzoate in the concentration known from the prior art.

For the treatment forms described above, ready-to-use packs of a medicament for the treatment of respiratory complaints are provided, containing an enclosed description including for example the words respiratory disease, COPD or asthma, a compound according to the invention and one or more combination partners selected from those described above.

The following example illustrates the present invention without restricting its scope:

Capsule for Powder Inhalation

1 capsule contains: active substance 0.5 mg lactose for inhalation 5.0 mg 5.5 mg

Preparation:

The active substance is mixed with lactose for inhalation. The mixture is packed into capsules in a capsule-making machine (weight of the empty capsule approx. 50 mg).

weight of capsule: 55.5 mg size of capsule=3 

What we claim:
 1. A compound of formula (I),

wherein A and A′ are independently from each other —CH₂— or —CH₂—CH₂—; R is selected from —NR¹R², —NR³R⁴R⁵⁽⁺⁾Z₁ ⁽⁻⁾ and —OR¹³; X is halogen; Z₁ ⁽⁻⁾ is a halogen anion or an organic acid anion; Z₂ ⁽⁻⁾ is a halogen anion or an organic acid anion; Z₃ ⁽⁻⁾ is a halogen anion or an organic acid anion; Z₄ ⁽⁻⁾ is a halogen anion or an organic acid anion; R¹ and R² are selected independently from each other from H, —C(NH₂)NH, —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻, —C₁₋₃-alkyl, —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹², —C₁₋₃-alkyl-COOH, —C₁₋₄-alkyl-CO—Y²—R¹¹, —CO-phenyl-CO—O—R¹³, —CO—C₁₋₄-alkyl, —CO—C₁₋₃-alkyl-NR⁶R⁷, —CO—C₁₋₃-alkyl-N(CH₃)₃ ⁺Z₃ ⁻, —CO—C₁₋₄-alkyl-Y¹—R⁹, —CO—O—C₁₋₄-alkyl-R⁸, —CO—NH—C₃₋₇-cycloalkyl, —CO—NH—C₁₋₄-alkyl, —CH₂—CO—O—C₁₋₃-alkyl, —CH₂—CO—O—C₁₋₃-alkyl-phenyl and —SO₂—R¹⁰; R⁶ is selected from —C₁₋₃-alkyl, H, —C₁₋₄-alkyl-OH, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH; R⁷ is selected from —C₁₋₃-alkyl, —CO—O—C₁₋₃-alkyl, —C₁₋₄-alkyl-OH, H, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH; R⁸ is H or phenyl; R⁹ is selected from H, —C₁₋₃-alkyl, OH, —NR⁶R⁷ and ═O; R¹⁰ is C₁₋₃-alkyl or an optionally substituted N-containing nonaromatic heterocycle; R¹¹ is selected from H, C₁₋₃-alkyl, ═O, —N(CH₃)₂ and —N(CH₃)₃ ⁺Z₄ ⁻; R¹² is selected from H, halogen, —COOH, —PO(OC₁₋₄-alkyl)OH optionally substituted at the 2, 3 or 4 position of the C₁₋₄-alkyl group by —N(C₁₋₃-alkyl)₂ or —N(C₁₋₃-alkyl)₃ ⁺Z₄ ⁻, and —PO(OC₁₋₄-alkyl)₂, —PO(OH)₂; R¹³ is H or C₁₋₄-alkyl; Y¹ is selected from an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle, —N(C₁₋₃-alkyl)-C₂₋₄-alkyl-N(C₁₋₃-alkyl)₂ and —N(C₁₋₃-alkyl)-C₂₋₄-alkyl-N⁺(C₁₋₃alkyl)₃ Z₁ ⁽⁻⁾; Y² is an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle; or R¹ and R² are together with the nitrogen atom they are attached to an optionally substituted 4-7-membered heterocycle, containing at least one N and optionally one or more heteroatoms selected from the group consisting of piperazino, morpholino, piperidino; thiomorpholino, thiomorpholino-1-oxide, thiomorpholinon-1,1-dioxide, diazepane and pyrrolidino, wherein the nitrogen atoms may be substituted by a group selected from among phenyl, C₁₋₃-alkylsulfonyl, C₁₋₃-alkyl and —CO—C₁₋₃-alkyl; R³, R⁴ and R⁵ denote independently from each other —C₁₋₃-alkyl; or tautomers or pharmacologically acceptable acid addition salts thereof.
 2. The compound of formula (I) according to claim 1, wherein A and A′ are both —CH₂—CH₂—; R is —NR¹R² or —NR³R⁴R⁵⁽⁺⁾X⁽⁻⁾; X is halogen; R¹ and R² are selected independently from each other from H, —C(NH₂)NH, —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻, —C₂₋₄-alkyl-N(CH₃)₂—C₁₋₃-alkyl-phenyl-R¹², —C₁₋₃-alkyl-COOH, —C₁₋₄-alkyl-CO—Y²—R¹¹, —CO-phenyl-CO—O—C₁₋₄—R¹³—CO—C₁₋₄-alkyl, —CO—C₁₋₃-alkyl-NR⁶R⁷, CO—C₁₋₃-alkyl-N(CH₃)₃ ⁺ Z₃ ⁻, —CO—C₁₋₄-alkyl-Y¹—R⁹, —CO—O—C₁₋₄-alkyl-R⁸, —CO—NH—C₃₋₇-cycloalkyl, —CO—NH—C₁₋₄-alkyl, —CH₂—CO—O—C₁₋₃-alkyl, —CH₂—CO—O—C₁₋₃-alkyl-phenyl, —SO₂—R¹⁰; R⁶ is selected from —C₁₋₃-alkyl, H, —C₁₋₄-alkyl-OH, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH; R⁷ is selected from —C₁₋₃-alkyl, —CO—O—C₁₋₃-alkyl, —C₁₋₄-alkyl-OH, H, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂COOH; R⁸ is H or phenyl; R⁹ is selected from H, —C₁₋₃-alkyl, —OH, —NR⁶R⁷ and ═O; R¹⁰ is C₁₋₃-alkyl or an optionally substituted N-containing nonaromatic heterocycle; R¹¹ is selected from H, —C₁₋₃-alkyl, ═O, —N(CH₃)₂ and —N(CH₃)₃ ⁺X⁻; R¹² is H or halogen; R¹³ is H or —C₁₋₄-alkyl; Y¹ is an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle, Y² is an optionally substituted 5- to 8-membered N-containing nonaromatic heterocycle, or R¹ and R² are together with the nitrogen atom they are attached to an optionally substituted 4-7-membered heterocycle containing at least one N-atom; R³, R⁴ and R⁵ are selected independently from each other —C₁₋₃-alkyl; or tautomers or pharmacologically acceptable acid addition salts thereof.
 3. The compound of formula (I) according to claim 1, wherein R is —NR¹R²; or tautomers or pharmacologically acceptable acid addition salts thereof.
 4. The compound of formula (I) according to claim 1, wherein R¹ and R² are independently from each other H, —C₁₋₄-alkyl-CO—Y²—R¹¹ or —CO—C₁₋₄-alkyl-Y¹—R⁹; R⁹ is selected from H, —C₁₋₃-alkyl, —OH, —NR⁶R⁷ and ═O; R¹¹ is selected from H, —C₁₋₃-alkyl, ═O, —N(CH₃)₂ and —N(CH₃)₃ ⁺X⁻; Y¹ is selected from a linker of formula (a1) to (j1)

wherein * denotes the attachment point to the alkyl moiety of —CO—C₁₋₄-alkyl-* ** denotes the attachment point to R⁹; Y² is selected from a linker of formula (a2) to (h2)

wherein * denotes the attachment point to the carbonyl moiety of —C₁₋₄-alkyl-CO—* ** denotes the attachment point to R¹¹; or tautomers or pharmacologically acceptable acid addition salts thereof.
 5. The compound of formula (I) according to claim 1, wherein R¹ and R² independently from each other denote H, —C(NH₂)NH or —CN(CH₃)₂N(CH₃)₂ ⁺Z₂ ⁻; or tautomers or pharmacologically acceptable acid addition salts thereof.
 6. The compound of formula (I) according to claim 1, wherein R¹ and R² independently from each other are selected from —C₁₋₃-alkyl, —C₂₋₄-alkyl-N(CH₃)₂, —C₁₋₃-alkyl-phenyl-R¹², —C₁₋₃-alkyl-COOH, —CH₂—CO—O—C₁₋₃-alkyl and —CH₂—CO—O—C₁₋₃-alkyl-phenyl; or tautomers or pharmacologically acceptable acid addition salts thereof.
 7. The compound of formula (I) according to claim 1, wherein R¹ and R² independently from each other are selected from —CO-phenyl-CO—O—C₁₄—R¹³, —CO—C₁₋₄-alkyl and —CO—C₁₋₃-alkyl-NR⁶R⁷; or tautomers or pharmacologically acceptable acid addition salts thereof.
 8. The compound of formula (I) according to claim 1, wherein R¹ and R² independently from each other are selected from —CO—O—C₁₋₄-alkyl-R⁸ and —SO₂—R¹⁰; or tautomers or pharmacologically acceptable acid addition salts thereof.
 9. The compound of formula (I) according to claim 1, wherein R¹ and R² are hydrogen; or tautomers or pharmacologically acceptable acid addition salts thereof.
 10. A method of treating a disease selected from among respiratory diseases or complaints and allergic diseases of the airways comprising administering a therapeutically effective amount of a compound according to claim 1 to patient in need thereof.
 11. The method according to claim 10 wherein the disease is selected from chronic bronchitis, acute bronchitis, bronchitis caused by bacterial or viral infection or fungi or helminths, allergic bronchitis, toxic bronchitis, chronic obstructive bronchitis (COPD), asthma (intrinsic or allergic), pediatric asthma, bronchiectasis, allergic alveolitis, allergic or non-allergic rhinitis, chronic sinusitis, cystic fibrosis or mucoviscidosis, alpha1-antitrypsin deficiency, cough, pulmonary emphysema, interstitial lung diseases, alveolitis, hyperreactive airways, nasal polyps, pulmonary oedema and pneumonitis of different origins.
 12. A pharmaceutical composition comprising a compound according to claim 1 or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.
 13. A pharmaceutical composition according to claim 12 further comprising, as further active substances, one or more compounds selected from among the categories of further ENaC inhibitors, betamimetics, anticholinergics, corticosteroids, PDE4-inhibitors, LTD4-antagonists, EGFR-inhibitors, dopamine agonists, H1-antihistamines, PAF-antagonists, MAP-kinase inhibitors, MPR4-Inhibitors, iNOS-Inhibitors, SYK-Inhibitors, corrections of the cystic fibrosis transmembrane regulator (CFTR) and CFTR potentiators. 